I am levelling up an sorcerer npc, that accompanies PCs. He focuses on the use of fire magic.
I really enjoyed Warmage Edge class feature and I wonder, if there is some similar feature, that may be obtained by a feat or magic item, but would be charisma based and would affect more than "only warmage spells". I was hoping I could find something in Complete Arcane or Divine, but sadly there was nothing.
Warmage Edge (Ex): A warmage is specialized in dealing damage with his spells. Whenever a warmage casts a spell that deals hit point damage, he adds his Intelligence bonus (if any) to the amount of damage dealt. For instance, if a 1st-level warmage with 17 Intelligence casts magic missile, he deals 1d4+1 points of damage normally, plus an extra 3 points of damage due to his Intelligence bonus. The bonus from the warmage edge special ability applies only to spells that he casts as a warmage, not to those he might have by virtue of levels in another class.
A single spell can never gain this extra damage more than once per casting. For instance, a fireball deals the extra damage to all creatures in the area it affects. However, if a 3rd-level warmage casts magic missile and produces two missiles, only one of them (of the warmage's choice) gains the extra damage, even if both missiles are directed at the same target. If a spell deals damage for more than 1 round, it deals this extra damage in each round.
3.0, 3.5, Dugeon Adventures and Dragon Magazines allowed.