xyianth
2015-10-23, 05:30 AM
I'm attempting to optimize the Pestilential Touch ability of the Nosomatic Chirugeon prestige class from Dragonmarked. Unlike other attempts that I have been able to find, I am trying to expand the ability to allow casting of other spells. I think I have found an interesting chain of abilities that will allow this, but I would like to get some second opinions from my fellow playgrounders.
For this thought experiment, I am proposing the following build:
Race: Glimmerskin Halfling
32pt: 10(8) str, 16(18) dex, 14 con, 14 int, 10 wis, 14 cha
Alignment: Chaotic Neutral
All ability boosts go to Dex
Level
Class
Base Attack Bonus
Fort Save
Ref Save
Will Save
Skills
Feats
Class Features
1st
Warlock 1
+0
+0
+0
+2
Heal 4, Intimidate 1, Knowledge(nature) 2(cc), Knowledge(religion) 2, Sense Motive 1, Survival 2(cc)
Least Dragnmark(Mark of Healing: lesser restoration)
eldritch blast 1d6, summon swarm invocation
2nd
Warlock 2
+1
+0
+0
+3
Heal 5, Intimidate 1, Knowledge(nature) 2(cc), Knowledge(religion) 2, Sense Motive 2, Survival 2(cc)
detect magic, baleful utterance invocation
3rd
Warlock 3
+2
+1
+1
+3
Heal 6, Intimidate 1, Knowledge(nature) 3(cc), Knowledge(religion) 2, Sense Motive 3, Survival 3(cc)
Touchstone(City of the Dead)
Damage Reduction 1/cold iron, eldritch blast 2d6
4th
Warlock 4
+3
+1
+1
+4
Heal 7, Intimidate 1, Knowledge(nature) 3(cc), Knowledge(religion) 2, Sense Motive 3, Spellcraft 1, Survival 3(cc)
Deceive Item, see the unseen invocation
5th
Binder 1
+3
+3
+1
+6
Heal 8, Intimidate 1, Knowledge(nature) 4(cc), Knowledge(religion) 2, Sense Motive 4, Spellcraft 1, Survival 4(cc)
Soulbinding
6th
Nosomatic Chirurgeon 1
+3
+5
+1
+8
Heal 8, Intimidate 1, Knowledge(nature) 4, Knowledge(religion) 2, Search 6, Sense Motive 4, Spellcraft 1, Survival 4
Mother Cyst, Lesser Dragonmark(Mark of Healing: restoration){Heir's Mark}
Heir's Mark, Nosomatic Chirurgery, Pestilential Touch, Adept Spellcasting, Oracle domain, eldritch blast 3d6
7th
Sand Shaper 1
+3
+5
+1
+10
Heal 8, Intimidate 1, Knowledge(nature) 4, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 4, Survival 4
Desert Insight, Dust Magic, Sand Shape
8th
Ruathar 1
+3
+5
+3
+12
Heal 8, Intimidate 1, Knowledge(nature) 4, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 4, Spot 8, Survival 4
Word of Friendship, Gift of the Elves, eldritch chain blast shape, summon swarm invocation -> eldritch glaive blast shape
9th
Ruathar 2
+4
+5
+4
+13
Heal 8, Hide 8, Intimidate 1, Knowledge(nature) 4, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 4, Spot 8, Survival 4
Practiced Spellcaster(Warlock)
Low-light Vision, Elfwise, eldritch blast 4d6
10th
Unseen Seer 1
+4
+5
+4
+15
Heal 8, Hide 8, Intimidate 1, Knowledge(nature) 4, Knowledge(the planes) 4, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 6, Spot 8, Survival 4, Speak Language(Infernal)
Damage Bonus +1d6, sudden swarm invocation
11th
Unseen Seer 2
+5
+5
+4
+16
Heal 8, Hide 8, Intimidate 1, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 6, Spot 8, Survival 4, Speak Language(Infernal)
Advanced Learning(hunter's eye), eldritch blast 5d6
12th
Unseen Seer 3
+6
+6
+5
+16
Heal 8, Hide 8, Intimidate 4(cc), Knowledge(arcana) 2, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 6, Spot 8, Survival 4, Speak Language(Infernal)
Weapon Finesse
Divination Spell Power +1, hellrime blast eldritch essence
13th
Unseen Seer 4
+7
+6
+5
+17
Heal 8, Hide 8, Intimidate 6(cc), Knowledge(arcana) 6, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 6, Spot 8, Survival 4, Speak Language(Infernal)
Damage Bonus +2d6, eldritch blast 6d6, vitriolic blast eldritch essence
14th
Hellfire Warlock 1
+7
+6
+5
+19
Heal 8, Hide 8, Intimidate 6, Knowledge(arcana) 10, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 6, Spot 8, Survival 4, Speak Language(Infernal)
Hellfire Blast +2d6
15th
Hellfire Warlock 2
+8
+6
+5
+20
Heal 8, Hide 8, Intimidate 6, Knowledge(arcana) 14, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 6, Spot 8, Survival 4, Speak Language(Infernal)
Infernal Adept(humanoid shape invocation)
Hellfire Blast +4d6, Hellfire Infusion, Resistance to Fire 10, chilling tentacles invocation[/td]
16th
Hellfire Warlock 3
+9
+7
+6
+20
Heal 8, Hide 8, Intimidate 6, Knowledge(arcana) 18, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 6, Spot 8, Survival 4, Speak Language(Infernal)
Hellfire Blast +6d6, Hellfire Shield, eldritch blast 7d6
17th
Unseen Seer 5
+9
+7
+6
+20
Heal 8, Hide 8, Intimidate 6, Knowledge(arcana) 20, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 12, Spot 8, Survival 4, Speak Language(Infernal)
Advanced Learning(eye of stone), Guarded Mind, nightmares made real invocation
18th
Unseen Seer 6
+10
+8
+7
+21
Concentration 2, Heal 8, Hide 8, Intimidate 6, Knowledge(arcana) 21, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 19, Spot 8, Survival 4, Speak Language(Infernal)
Combat Reflexes
Divination Spell Power +2, dark foresight invocation
19th
Unseen Seer 7
+11
+8
+7
+21
Concentration 4, Heal 8, Hide 8, Intimidate 6, Knowledge(arcana) 22, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 22, Spot 8, Survival 4, Speak Language(Infernal)
Damage Bonus +3d6, eldritch blast 8d6
20th
Unseen Seer 8
+12
+8
+7
+22
Concentration 10, Heal 8, Hide 8, Intimidate 6, Knowledge(arcana) 23, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 23, Spot 8, Survival 4, Speak Language(Infernal)
Advanced Learning(moment of prescience), path of shadow invocation
Spells Known
bear's endurance, bull's strength, cat's grace, endure elements, parching touch, speak with animals, summon desert ally I, necrotic awareness
eagle's splendor, fox's cunning, heat metal, owl's wisdom, resist energy, summon desert ally II, summon swarm, necrotic cyst, necrotic scrying, hunter's eye
control sand, desiccate, dispel magic, dominate animal, haboob, slipsand, summon desert ally III, sunstroke, tormenting thirst, wind wall, necrotic bloat
blast of sand, summon desert ally IV, wall of sand, wither, necrotic domination
choking sands, flaywind burst, flesh to salt, summon desert ally V, transmute sand to stone, transmute stone to sand, necrotic burst
awaken sand, mummify, sandstorm, summon desert ally VI, necrotic eruption, eye of stone
mass flesh to salt, summon desert ally VII, necrotic tumor
summon desert ally VIII, whirlwind, necrotic empowerment, moment of prescience
summon desert ally IX, necrotic termination
I'll start with the basic setup of the trick: combine Warlock Invocations with the Pestilential Touch ability from Nosomatic Chirurgeon to get at-will use of 'inflict' spells. This has been discussed at length several times and is often cited as a way to allow invocation users to count as real spellcasters for prestige class requirements. The important details to keep in mind about this ability are:
You can now cast spells spontaneously.
The ability does not specify if these spells are arcane or divine, but since you are 'converting' an arcane SLA it is reasonable to assume that these are arcane spells.
The ability does not grant you knowledge of the inflict spells by RAW; the ability does not require knowing the spells to cast them.
The ability does not grant you a spell list of any kind, nor do you gain spells per day or spell slots from this ability.
The next part of the trick is the special wording on Nosomatic Chirurgeon's spellcasting feature. Unlike most prestige classes that advance spellcasting, this class grants you the spellcasting of an Adept if you 'have no levels in a spellcasting class.' Warlocks are not a spellcasting class. Binders are not a spellcasting class. Therefore, this ability grants you the spellcasting of an Adept. Adepts are prepared divine spellcasters. Nosomatic Chirurgeon is an Eberron prestige class, therefore it stands to reason that this ability grants the spellcasting of Eberron Adepts. Eberron Adepts gain the benefit of 1 domain of their choice. It is important to note that this Adept spellcasting is gained in addition to advancing the invocation and eldritch blast progression of Warlock. Warlocks benefit from prestige classes that advance spellcasting. The two parts of this ability are not mutually exclusive and warlocks qualify for both parts simultaneously, therefore they gain both benefits. The important detail to keep in mind about this ability is:
You can now prepare and cast divine spells from the Adept list.
The next part of the trick is the Mother Cyst feat. This feat grants access to cyst spells. It also explicitly states: "You cast these spells like any other spell you can cast". You can cast inflict spells through the Pestilential Touch ability. The feat further states: "if you are a caster who prepares spells, you can prepare all necrotic cyst spells without referring to a spellbook, as if you had the Spell Mastery feat for each such spell." The Spell Mastery feat only applies to "spells you already know." This feat therefore grants you access to these spells, allows you to cast them through Pestilential Touch, and gives you a set of spells known. The important details to keep in mind about this ability are:
You can now convert SLA uses into the spells associated with the Mother Cyst feat in addition to inflict spells.
You know the spells associated with the Mother Cyst feat.
The next part of the trick is the Desert Insight ability of the Sand Shaper prestige class. This ability grants you knowledge of a list of spells. It explicitly states: "If you are a spontaneous caster (such as a sorcerer), these spells are available to you like any other spell you know." You are a spontaneous caster and you know the spells associated with the Mother Cyst feat. These spells are thus added to your known spells and available to cast via the Pestilential Touch ability. The important details to keep in mind about this ability are:
You can now convert SLA uses into the spells listed in the Desert Insight ability in addition to inflict spells and the spells associated with the Mother Cyst feat.
You know the list of Desert Insight spells in addition to the spells associated with the Mother Cyst feat.
The final part of the trick is the Advanced Learning ability of the Unseen Seer prestige class. This ability states: "you can add a new spell to your spellbook or list of spells known" The spell can be from any list, but must be a divination spell no higher than your highest level arcane spell you already know. It further states: "Once a new spell is selected, it is forever added to your spell list and can be cast just like any other spell on your list." You have a list of spells known that includes the spells associated with the Desert Insight ability and the Mother Cyst feat. You convert arcane SLAs into these spells via Pestilential Touch. This ability therefore lets you add divination spells to your list of known spells and allows them to be cast using the Pestilential Touch ability.
Using the build I listed at the beginning, you should gain the ability convert your Warlock Invocations into any Mother Cyst feat spell, any Desert Insight spell, any inflict spell, and any divination spells you select with Advanced Learning using your Pestilential Touch ability. Your Warlock Invocations are at-will. This therefore provides you a list of 64 spells that you can cast at-will. This is significantly more versatile than the 8 inflict spells granted by the base ability.
Does anyone see any flaws in the logic here? I realize that this trick, like all tricks, is subject to DM approval. It is almost certainly not RAI, but I think it works RAW. Thoughts?
For this thought experiment, I am proposing the following build:
Race: Glimmerskin Halfling
32pt: 10(8) str, 16(18) dex, 14 con, 14 int, 10 wis, 14 cha
Alignment: Chaotic Neutral
All ability boosts go to Dex
Level
Class
Base Attack Bonus
Fort Save
Ref Save
Will Save
Skills
Feats
Class Features
1st
Warlock 1
+0
+0
+0
+2
Heal 4, Intimidate 1, Knowledge(nature) 2(cc), Knowledge(religion) 2, Sense Motive 1, Survival 2(cc)
Least Dragnmark(Mark of Healing: lesser restoration)
eldritch blast 1d6, summon swarm invocation
2nd
Warlock 2
+1
+0
+0
+3
Heal 5, Intimidate 1, Knowledge(nature) 2(cc), Knowledge(religion) 2, Sense Motive 2, Survival 2(cc)
detect magic, baleful utterance invocation
3rd
Warlock 3
+2
+1
+1
+3
Heal 6, Intimidate 1, Knowledge(nature) 3(cc), Knowledge(religion) 2, Sense Motive 3, Survival 3(cc)
Touchstone(City of the Dead)
Damage Reduction 1/cold iron, eldritch blast 2d6
4th
Warlock 4
+3
+1
+1
+4
Heal 7, Intimidate 1, Knowledge(nature) 3(cc), Knowledge(religion) 2, Sense Motive 3, Spellcraft 1, Survival 3(cc)
Deceive Item, see the unseen invocation
5th
Binder 1
+3
+3
+1
+6
Heal 8, Intimidate 1, Knowledge(nature) 4(cc), Knowledge(religion) 2, Sense Motive 4, Spellcraft 1, Survival 4(cc)
Soulbinding
6th
Nosomatic Chirurgeon 1
+3
+5
+1
+8
Heal 8, Intimidate 1, Knowledge(nature) 4, Knowledge(religion) 2, Search 6, Sense Motive 4, Spellcraft 1, Survival 4
Mother Cyst, Lesser Dragonmark(Mark of Healing: restoration){Heir's Mark}
Heir's Mark, Nosomatic Chirurgery, Pestilential Touch, Adept Spellcasting, Oracle domain, eldritch blast 3d6
7th
Sand Shaper 1
+3
+5
+1
+10
Heal 8, Intimidate 1, Knowledge(nature) 4, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 4, Survival 4
Desert Insight, Dust Magic, Sand Shape
8th
Ruathar 1
+3
+5
+3
+12
Heal 8, Intimidate 1, Knowledge(nature) 4, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 4, Spot 8, Survival 4
Word of Friendship, Gift of the Elves, eldritch chain blast shape, summon swarm invocation -> eldritch glaive blast shape
9th
Ruathar 2
+4
+5
+4
+13
Heal 8, Hide 8, Intimidate 1, Knowledge(nature) 4, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 4, Spot 8, Survival 4
Practiced Spellcaster(Warlock)
Low-light Vision, Elfwise, eldritch blast 4d6
10th
Unseen Seer 1
+4
+5
+4
+15
Heal 8, Hide 8, Intimidate 1, Knowledge(nature) 4, Knowledge(the planes) 4, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 6, Spot 8, Survival 4, Speak Language(Infernal)
Damage Bonus +1d6, sudden swarm invocation
11th
Unseen Seer 2
+5
+5
+4
+16
Heal 8, Hide 8, Intimidate 1, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 6, Spot 8, Survival 4, Speak Language(Infernal)
Advanced Learning(hunter's eye), eldritch blast 5d6
12th
Unseen Seer 3
+6
+6
+5
+16
Heal 8, Hide 8, Intimidate 4(cc), Knowledge(arcana) 2, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 6, Spot 8, Survival 4, Speak Language(Infernal)
Weapon Finesse
Divination Spell Power +1, hellrime blast eldritch essence
13th
Unseen Seer 4
+7
+6
+5
+17
Heal 8, Hide 8, Intimidate 6(cc), Knowledge(arcana) 6, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 6, Spot 8, Survival 4, Speak Language(Infernal)
Damage Bonus +2d6, eldritch blast 6d6, vitriolic blast eldritch essence
14th
Hellfire Warlock 1
+7
+6
+5
+19
Heal 8, Hide 8, Intimidate 6, Knowledge(arcana) 10, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 6, Spot 8, Survival 4, Speak Language(Infernal)
Hellfire Blast +2d6
15th
Hellfire Warlock 2
+8
+6
+5
+20
Heal 8, Hide 8, Intimidate 6, Knowledge(arcana) 14, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 6, Spot 8, Survival 4, Speak Language(Infernal)
Infernal Adept(humanoid shape invocation)
Hellfire Blast +4d6, Hellfire Infusion, Resistance to Fire 10, chilling tentacles invocation[/td]
16th
Hellfire Warlock 3
+9
+7
+6
+20
Heal 8, Hide 8, Intimidate 6, Knowledge(arcana) 18, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 6, Spot 8, Survival 4, Speak Language(Infernal)
Hellfire Blast +6d6, Hellfire Shield, eldritch blast 7d6
17th
Unseen Seer 5
+9
+7
+6
+20
Heal 8, Hide 8, Intimidate 6, Knowledge(arcana) 20, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 12, Spot 8, Survival 4, Speak Language(Infernal)
Advanced Learning(eye of stone), Guarded Mind, nightmares made real invocation
18th
Unseen Seer 6
+10
+8
+7
+21
Concentration 2, Heal 8, Hide 8, Intimidate 6, Knowledge(arcana) 21, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 19, Spot 8, Survival 4, Speak Language(Infernal)
Combat Reflexes
Divination Spell Power +2, dark foresight invocation
19th
Unseen Seer 7
+11
+8
+7
+21
Concentration 4, Heal 8, Hide 8, Intimidate 6, Knowledge(arcana) 22, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 22, Spot 8, Survival 4, Speak Language(Infernal)
Damage Bonus +3d6, eldritch blast 8d6
20th
Unseen Seer 8
+12
+8
+7
+22
Concentration 10, Heal 8, Hide 8, Intimidate 6, Knowledge(arcana) 23, Knowledge(nature) 4, Knowledge(the planes) 12, Knowledge(religion) 2, Search 9, Sense Motive 4, Spellcraft 23, Spot 8, Survival 4, Speak Language(Infernal)
Advanced Learning(moment of prescience), path of shadow invocation
Spells Known
bear's endurance, bull's strength, cat's grace, endure elements, parching touch, speak with animals, summon desert ally I, necrotic awareness
eagle's splendor, fox's cunning, heat metal, owl's wisdom, resist energy, summon desert ally II, summon swarm, necrotic cyst, necrotic scrying, hunter's eye
control sand, desiccate, dispel magic, dominate animal, haboob, slipsand, summon desert ally III, sunstroke, tormenting thirst, wind wall, necrotic bloat
blast of sand, summon desert ally IV, wall of sand, wither, necrotic domination
choking sands, flaywind burst, flesh to salt, summon desert ally V, transmute sand to stone, transmute stone to sand, necrotic burst
awaken sand, mummify, sandstorm, summon desert ally VI, necrotic eruption, eye of stone
mass flesh to salt, summon desert ally VII, necrotic tumor
summon desert ally VIII, whirlwind, necrotic empowerment, moment of prescience
summon desert ally IX, necrotic termination
I'll start with the basic setup of the trick: combine Warlock Invocations with the Pestilential Touch ability from Nosomatic Chirurgeon to get at-will use of 'inflict' spells. This has been discussed at length several times and is often cited as a way to allow invocation users to count as real spellcasters for prestige class requirements. The important details to keep in mind about this ability are:
You can now cast spells spontaneously.
The ability does not specify if these spells are arcane or divine, but since you are 'converting' an arcane SLA it is reasonable to assume that these are arcane spells.
The ability does not grant you knowledge of the inflict spells by RAW; the ability does not require knowing the spells to cast them.
The ability does not grant you a spell list of any kind, nor do you gain spells per day or spell slots from this ability.
The next part of the trick is the special wording on Nosomatic Chirurgeon's spellcasting feature. Unlike most prestige classes that advance spellcasting, this class grants you the spellcasting of an Adept if you 'have no levels in a spellcasting class.' Warlocks are not a spellcasting class. Binders are not a spellcasting class. Therefore, this ability grants you the spellcasting of an Adept. Adepts are prepared divine spellcasters. Nosomatic Chirurgeon is an Eberron prestige class, therefore it stands to reason that this ability grants the spellcasting of Eberron Adepts. Eberron Adepts gain the benefit of 1 domain of their choice. It is important to note that this Adept spellcasting is gained in addition to advancing the invocation and eldritch blast progression of Warlock. Warlocks benefit from prestige classes that advance spellcasting. The two parts of this ability are not mutually exclusive and warlocks qualify for both parts simultaneously, therefore they gain both benefits. The important detail to keep in mind about this ability is:
You can now prepare and cast divine spells from the Adept list.
The next part of the trick is the Mother Cyst feat. This feat grants access to cyst spells. It also explicitly states: "You cast these spells like any other spell you can cast". You can cast inflict spells through the Pestilential Touch ability. The feat further states: "if you are a caster who prepares spells, you can prepare all necrotic cyst spells without referring to a spellbook, as if you had the Spell Mastery feat for each such spell." The Spell Mastery feat only applies to "spells you already know." This feat therefore grants you access to these spells, allows you to cast them through Pestilential Touch, and gives you a set of spells known. The important details to keep in mind about this ability are:
You can now convert SLA uses into the spells associated with the Mother Cyst feat in addition to inflict spells.
You know the spells associated with the Mother Cyst feat.
The next part of the trick is the Desert Insight ability of the Sand Shaper prestige class. This ability grants you knowledge of a list of spells. It explicitly states: "If you are a spontaneous caster (such as a sorcerer), these spells are available to you like any other spell you know." You are a spontaneous caster and you know the spells associated with the Mother Cyst feat. These spells are thus added to your known spells and available to cast via the Pestilential Touch ability. The important details to keep in mind about this ability are:
You can now convert SLA uses into the spells listed in the Desert Insight ability in addition to inflict spells and the spells associated with the Mother Cyst feat.
You know the list of Desert Insight spells in addition to the spells associated with the Mother Cyst feat.
The final part of the trick is the Advanced Learning ability of the Unseen Seer prestige class. This ability states: "you can add a new spell to your spellbook or list of spells known" The spell can be from any list, but must be a divination spell no higher than your highest level arcane spell you already know. It further states: "Once a new spell is selected, it is forever added to your spell list and can be cast just like any other spell on your list." You have a list of spells known that includes the spells associated with the Desert Insight ability and the Mother Cyst feat. You convert arcane SLAs into these spells via Pestilential Touch. This ability therefore lets you add divination spells to your list of known spells and allows them to be cast using the Pestilential Touch ability.
Using the build I listed at the beginning, you should gain the ability convert your Warlock Invocations into any Mother Cyst feat spell, any Desert Insight spell, any inflict spell, and any divination spells you select with Advanced Learning using your Pestilential Touch ability. Your Warlock Invocations are at-will. This therefore provides you a list of 64 spells that you can cast at-will. This is significantly more versatile than the 8 inflict spells granted by the base ability.
Does anyone see any flaws in the logic here? I realize that this trick, like all tricks, is subject to DM approval. It is almost certainly not RAI, but I think it works RAW. Thoughts?