Credit on this one goes in part to my D&D sparring partner, Manticlara. May your dice grow ever rounder.
Cultist of Tiamat
The Cult of the Dragon has, in more recent years, held a slightly different worldview from what they used to. These days, they want to see dragons rule the world. Tiamat, in particular, is a point of focus for them. The Cultist of Tiamat devotes their life to seeing the reign of dragons come about, so long as they get credit for helping and a nice comfortable place of power when it does.
Alignment: While any nongood character may become a Cultist of Tiamat, they are most commonly found among the Evil and the Chaotic, those wishing to sow destruction and a new ruling order in the world.
Religion: Cultists of Tiamat invariably revere Tiamat, though they may or may not worship her. Other deities that share her goals and ambitions may be revered as well.
Background: Some Cultists of Tiamat were born into the cult, though most joined of their own volition.
Adaptation: The Cultist can easily be a cultist of another dragon deity, or even devoted to another type of creature entirely. Though credulity begins to strain if you take the features and tactics to a Good alignment, there's nothing preventing you from rewriting the class slightly to fit.
GAME RULE INFORMATION
Cultists of Tiamat have the following game statistics.
Abilities: Intelligence determines the highest level spell the Cultist can cast, and by extension how many spells can be cast. Charisma determines how hard these spells are to resist, as well as the class abilities. Several important class skills are based off of Charisma as well. Dexterity and Constitution are as important for survival as they are to any character.
Alignment: Any nongood
Hit Die: d6
Starting Age: As Cleric
Starting Gold: As Cleric
The Cultist of Tiamat's class skills (and the key ability for each skill) are Bluff (CHA), Concentration (CON), Craft (INT), Decipher Script (INT), Diplomacy (CHA), Knowledge: Arcana (INT), Knowledge: Religion (INT), Profession (WIS), Sense Motive (WIS), and Spellcraft (INT).
Skill Points at First Level: (2 + Int modifier) x 4
Skill Points at Each Additional Level: 2 + Int modifier
CULTIST OF TIAMAT
Level Base Attack Bonus Fort Save Ref Save Will Save Special Spell Level 1st +0 +0 +0 +2 Ritual Aide 1st 2nd +1 +0 +0 +3 Chromatic Blast 1d8, Chromatic Resistance 1st 3rd +2 +1 +1 +3 Presence of Dragons 1st 4th +3 +1 +1 +4 Heighten Spell 2nd 5th +3 +1 +1 +4 Chromatic Blast 2d8 2nd 6th +4 +2 +2 +5 Chromatic Blast (two types) 2nd 7th +5 +2 +2 +5 Dragon Summoning, Dragon Familiar 3rd 8th +6/+1 +2 +2 +6 Chromatic Blast 3d8 3rd 9th +6/+1 +3 +3 +6 Charm Dragon 4th 10th +7/+2 +3 +3 +7 Chromatic Blast (reduced cooldown) 4th 11th +8/+3 +3 +3 +7 Rapid Dragon Ally 5th 12th +9/+4 +4 +4 +8 Chromatic Blast 4d8 5th 13th +9/+4 +4 +4 +8 Reasonable Request 6th 14th +10/+5 +4 +4 +9 Chromatic Blast (120ft range) 6th 15th +11/+6/+1 +5 +5 +9 Dragon Quest 7th 16th +12/+7/+2 +5 +5 +10 Chromatic Blast 5d8 8th 17th +12/+7/+2 +5 +5 +10 Prolonged Stay, Mass Charm Dragon 9th 18th +13/+8/+3 +6 +6 +11 Chromatic Blast (four types) 10th 19th +14/+9/+4 +6 +6 +11 Dominate Dragon 11th 20th +15/+10/+5 +6 +6 +12 Chromatic Blast 6d8, Reign of Tiamat 12th
All of the following are class features of the Cultist of Tiamat.
Weapon and Armor Proficiencies: The Cultist of Tiamat is proficient with all simple weapons, but not with any armor or shields. Wearing armor of any kind may interferer with spellcasting, just as it would with a Wizard.
The Cultist of Tiamat has two spell slots. Once they have cast a spell using this feature, the spell slot is regained one level lower than the one that was spent. When this feature is used to cast with a Level 1 spell slot, the slot is not recovered in this way. After 8 hours of rest, the Cultist may spend 15 minutes in prayer to refresh both spell slots to the highest allowed by this feature, reduced by 1 for every spell cast using this feature in the last 8 hours.
The primary spell slot is of a level equal to the one given in the table above, or of a level equal to the Cultist's Intelligence score -10, whichever is lower. The secondary spell slot is of a level equal to the one given in the table above, or of a level equal to the Cultist's Intelligence modifier, whichever is lower. If either of these spell slots would be of a level lower than 1, that spell slot is not granted by this feature.
Save DCs are calculated using the Cultist's Charisma score. The Cultist of Tiamat casts spells spontaneously from the Cultist of Tiamat spell list. [Okay, this doesn't exist yet. You got me there. But the goal is to draw from the Sorcerer list for spells like Fireball, Acid Fog, Dominate Monster, Aspect of the Chromatic Dragon, Dragon Ally, and so forth. Some blasty spells for a breath weapon feel, some dominating/charming spells, some dragon-y stuff.]
A Cultist's bonus language options include Draconic. This is in addition to the bonus languages available to the character because of his race.
Any Cultist of Tiamat is able to participate in summoning rituals performed by higher level Cultists. See the Dragon Summoning ritual ability below for more information.
Chromatic Blast (Su)
The Cultist of Tiamat may loose a blast of channeled arcane fury inspired by their draconic mistress. As a standard action, the cultist must select either Acid, Fire, Cold, or Electricity. They then make a ranged touch attack against a target within 60ft, dealing 1d6 damage of the selected element on a successful hit. Once an energy type has been used this way, that type cannot be selected again for 1d4 rounds. The damage dealt by this ability increases as the Cultist gains levels, as shown on the table above. At level 10, the amount of time an element cannot be selected after being used is only 1 round. At level 14, the range increases to 120ft. At level 6, the Cultist may layer a second element into the ray, splitting the damage evenly between the two, but triggering both cooldowns. At level 18, they may layer all four elements into the ray if they so wish.
Chromatic Resistance (Su)
Beginning at level 2, the Cultist of Tiamat gains energy resistance against the following energy types: Acid, Fire, Cold, and Electricity. The amount of this resistance is equal to half the class level of the Cultist, rounded down. If the cultist casts a spell with any of those four descriptors, or uses their Chromatic Blast ability, then their resistance against the type of energy just used is doubled until the Cultist's next turn.
Presence of Dragons (Ex)
The Cultist of Tiamat admires dragons and does not fear them. At level 3, the Cultist is immune to the Frightful Presence of dragons.
The Cultist gains Heighten Spell as a bonus feat.
Dragon Summoning (Sp)
Beginning at level 7, the Cultist of Tiamat may perform an hour-long ritual to summon a chromatic dragon. While this ritual can be performed alone, it benefits if the cultist has acolytes to assist. The dragon that is summoned may have a total hit dice of equal to or less than the Caster Level of the Cultist leading the ritual. This number is increased by 2 for every cultist with this ability who participates in the ritual and by 1 for every cultist with the Ritual Aide ability that assists, but may not exceed twice the Cultist level of the ritual leader. The dragon summoned is of a type indicated on the chart below, though the DM may modify this chart to better represent the dragons in the world. When summoned, the dragon appears in center of the ritual circle and may be bargained with. If bargained with, the summoned dragon requires payment for its services, which takes the form of coins, gems, or other precious objects the dragon can add to its hoard. This payment must be made before the dragon agrees to perform any services. The bargaining takes at least 1 round so any actions by the creature begin in the round after it arrives. The ritual itself does not force the dragon to remain and bargain, so the cultist must employ other means to protect themselves and hold the dragon's attention. Tasks requiring up to 1 minute per caster level require a payment of 50 gp per HD of the called dragon. For a task requiring up to 1 hour per caster level, the creature requires a payment of 250 of per HD. Long-term tasks (those requiring up to 1 day per caster level) require a payment of 500 gp per HD). Especially hazardous tasks require a greater gift, up to twice the given amount. A dragon never accepts less than the indicated amount, even for a nonhazardous task. At the end of its task, or when the duration bargained for elapses, the creature returns to the place it was called from (after reporting back to you, if appropriate and possible).
d10 Dragon summoned 1-4 Player's Choice (from this list) 5 Black 6 Red 7 Green 8 Blue 9 White 0 DM's Choice
Dragon Familiar (Su)
At level 7, the Cultist of Tiamat may perform a specialized Dragon Summoning ritual to summon a familiar, as if they had the Dragon Familiar feat.
Rapid Dragon Ally
The casting time of any of the Dragon Ally spells cast as a Cultist of Tiamat are reduced to 1 minute, from 10 minutes.
Charm Dragon (Sp)
Once per day at level 9, the Cultist of Tiamat may attempt to Charm a dragon, as the spell Charm Monster, with a save DC equal to 10+CHA+(1/2 Cultist level). At level 17, this ability may be applied to multiple dragons, as the spell Mass Charm Monster.
When performing the Dragon Summoning ritual or casting the Dragon Ally spells, the Cultist of Tiamat may make a diplomacy check to convince the dragon to aid them for a reduced payment. If the diplomacy check adjusts the dragon's attitude to friendly, the dragon will agree to work for 50% of the standard fee, as long as the task is one that is not against their nature.
Dragon Quest (Sp)
At level 15, the Cultist of Tiamat may issue a Quest (as the spell) to a dragon. This ability is usable once per week.
Beginning at level 17, whenever a Cultist of Tiamat cals or summons a dragon via a class feature or spell, the duration of the effect is doubled. This ability stacks with that of the Extend Spell metamagic feat. This ability also applies to the Cultist's Charm Dragon, Dragon Quest, and Dominate Dragon abilities.
Dominate Dragon (Sp)
Once per day at level 19, the Cultist of Tiamat may attempt to Dominate a dragon, as the spell Dominate Monster, with a save DC equal to 10+CHA+(1/2 Cultist level).
Reign of Tiamat
When performing the Dragon Summoning ritual, a level 20 Cultist of Tiamat may wind up attracting the presence of Tiamat herself. The chances of this occurring are 1%, +1% for every assisting Cultist with the Reign of Tiamat ability. This ability confers no control over the deity.