:: Thrall of Graz'zt Spellcasting (Monstrous Humaniod) ::

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 known, and caster level accordingly.