Spoiler: Level 1
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We start as a warlock and the invocation we take is a defensive one as our saves are not good, in our main save we have a bad stat as this character is nearly mad so his wisdom is not high, but our charisma is good so we can use this to boost one of our saves (at low levels probably fortitude or reflexes but depends on the enemies) . We have a feat that blocks our blindness with the sun so if we will have to fight above is not a problem. Our main weapon is eldritch blast , and for now we stay away using this blast to hit the enemies. As skill we are not bad if we have a social situation, and concentration can be used to cast our eldritch blast
Spoiler: Level 2,3
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At the second level we gain detect magic at will that is useful but for now we don’t have spellcraft so is not so much useful but we gained even a new invocation baleful utterance If we use detect magic to find which items are not magic we can use baleful utterance to destroy it so giving problem to our enemy in many case. At level 3 we gain another d6 of eldritch blast and weapon finesse so now if we need we can fight in melee using the racial proficiency with rapier. Baleful utterance can be useful against some golems that could be a problem with our eldritch blast
Spoiler: Level 4,5
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The last two level of warlock for this build and a level where we gain a very useful ability for a warlock , deceive item. From the level 4 we will not put any other ranks in use magic device , as for the wands (that are the ones that we need more see later) we already reach the 20 needed to use them , as we have 6 ranks+4 charisma(thanks to the point of level 4) and we can take 10 so is 20 , so now we can use wands. But a wand is better than our eldritch blast? Maybe depend on the wand as now we have gained another d6 of eldritch blast and we can combine it with hideous blow and our rapier to do 4d6 on total for now or 3d6 at touch
Spoiler: Level 6
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Now this is the level that combine each thing of previous element as we enter in a prestige class. But what is interesting in this prestige class ,that we miss the lesser invocation of the warlock? Well basically now we have various option for each combat, many more than any invocation could give us as our damnation point are a good resource and are based on our charisma. These demonbind give each one temporary hit points, and the best for us are
Succubus. It doesn’t use many damnation points so the last two we have can be used to buff our skills, even if is only a round is still good especially on bluff.
Babau Is one of the few demonbind that we can use without losing anything on our eldritch blast , and we even gain sneak attack so if needed we could do a little ambush with the spells in our wand and eldritch blast. The bonus damage on eldritch blast is another dice basically, 5 is higher than the average of a d6 at least
Vrock This one is good if we have access to a charisma boosting item as is similar to babau but higher
Yochol and Bebilith are good for the hitpoints but their bonus is not easy depends on the situation
The use of the wand is combined with hideous blow ,in the form of Wandstrike, that permits us to attack with a wand dealing damage and if we want to activate it, and as eldricht blast is not a bonus damage (as it is a separate mechanics than the one listed) we can do even more damage. So as we are melee the temporary hitpoints of the demonbinder are useful
We boost even our detect magic with some ranks in spellcraft but is nothing so high and baleful utterance is still useful as a combo, other than being the invocation necessary to enter in the demonbinder
Spoiler: Epic 1 , 2
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With these feats we cover the weak spot (for now ) of this character as our combo need a good concentration check to work (16) and we doesn’t need a dice to ruin our tactics so the first feat is steady concentration so we will not have any problem with the check. Force of personality is a different matter , is good as a mechanical effect and I think that to bind to demons, be ready to sell his soul to other demons one should be charismatic so this will help us
Spoiler: Epic 3,4
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These feat are good with our tactics, craft wand to create our weapons using our allies spell , or our spell like abilities that are similar to a spell so Detect magic and Shatter as wands. Maximize spell like abilities is useful to do more damage with our eldritch blast especially if we are quite sure to hit and maybe we even give bonus from our demonbinds
Spoiler: Epic 5, 6,7
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Our soul is already damned between Lolth and the demonbinds we use so why not take some vile feats that strengthen our bond with demons? Evil brand is useful so we can do our social abilities in a better way with evil , while thrall to demon is not so good as we don’t need so much a +1 to something, except saves maybe Is more a tax feat than anything else as the next feat permit us to sell again our soul (as we already did not) and it give a good bonus , in our case the possibility to summon a tanar’ri to our side for one hour. Remember when we took craft wand? Now we can use the ability of this tanar’ri to boost our wands as spell , in this case we can summon a dretch to put his spell like abilities in wand. We can even use this feat to summon a rutterkin to take time while we do the demonbind, so in each round there will be at least one to attack .
Spoiler: Epic 8,9,10
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After we took abyss bound soul we are near the Abyss so for that I took some abyss heritor feats that can be useful the first is demonic skin as more AC is good , so a bonus can be taken. The second is keeper of forbidden lore, the main bonus is the spellcraft bonus as we can use it with our detect magic to recognise more easily the spells and even the knowledge (the planes) is good because we have invested some more in that skill. The third is a boost to our DR or better another type that is stronger as that feat give us DR 3 not 1 like the warlock
Spoiler: Numbers on this build
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Hit points without demonbinding 6+4d6+1d4+6= around 29 so maximum 54 with demonbinding a vrock
Bluff maximum +4(charisma)+5(ranks) +5 (demonbinding succubus)=14
Diplomacy +4 (charisma)+0 (ranks)+5(demonbinding succubus)+4 (synergy)+2 (evil brand with evils)=15
Saves
fortitude 8 (3 base +1 constitution+4 dark one own luck)
reflex 4 (1 base+3 dexterity)
will (with force of personality and race effect) 12( 6 base+ 4 charisma +2 race)