All the following are class features of the thrall of Graz'zt prestige class.

Weapon and Armor Proficiency: Thralls of Graz'zt are proficient with no weapons, armor, or shields.

Spells: When a thrall of Graz'zt gains 1st level, and every two levels after that (plus 10th level), the character gains new spells per day as if she had also gained a level in whatever spellcasting class she belonged to before she added the prestige class. She does not, however, gain any other benefit a character of that class would have gained (improved chance of controlling or rebuking undead, metamagic or item creation feats, hit points, beyond those received from the prestige class, and so on), except for an increased effective level of spellcasting. This essentially means that she adds the new level of thrall of Graz'zt to the level of whatever other spellcasting class the character has., then determines spells per day, spells knowns, and caster level accordingly. For example, if Kalleyis, an 8th-level wizard, gains new spells as if she had risen to 9th level in wizard, bus she uses the other thrall of Graz'zt aspects of level progression such as base attack bonus and save bonus. If she next gains a level of wizard, making her a 9th-level wizard/ 1st-level thrall of Graz'zt, she gains spells as if she had risen to 10-th level wizard.

If a character had more than one spellcasting class before she became a thrall of Graz'zt, she must decide to which class she adds the level of thrall of Graz'zt.

Charm (Sp): A thrall of Graz'zt can produce an effect identical to that of a charm person spell cast by a caster of the thrall of Graz'zt level.

Spell Betrayal (Sp): When casting a damage-dealing spell at a target or targets denied the Dexerity bonus, a thrall of Graz'zt of 2nd level or higher can increase the amount of damage dealt. A 2nd-level thrall, for example, adds +1d6 points of damage to a spell cast against flatfooted targets. Graz'zt grants this ability in the hope that the thrall will convince her enemies that she is their friend, then betray them with a surprise magical attack. the damage increase goes up by +1d6 for every two levels beyond 2nd, to +5d6 at 10th level.

Dark Charisma(Ex): At 3rd level, a thrall of Graz'zt can add an enhancement bonus on certain Charisma-based skill checks. The bonus is +1 at 3rd level, +2 at 5th level, and +3 at 7th level. The bonus improves Animal Empathy, Diplomacy, Bluff, Gather Information, Handle Animal, and Perform checks when dealing with evil creatures.

Summon Demon(Sp): A 4th-level thrall of Graz'zt can summon a demon of 5 HD or less once per day. This functions as a summon monster spell cast by a 15th level caster. A 9th-level thrall of Graz'zt can summon a demon of 10 HD or less once per day.

Spellstrike (Su): If a thrall of Graz'zt casts a damaging spell upon a target or targets threatened in melee (and thus distracted), the thrall can add half of the spell betrayal bonus (round down) to the damage dealt. Thus a 6th-level or a 7th-level thrall of Graz'zt deals an additional +1d6 points of damage with a spell against threatened targets. At 8th level and higher, this bonus damage increases to +2d6 points.