Your ability to deal spell damage is particularly striking.
Prerequisite: Warmage level 4th.
Benefit: You gain a +1 bonus on your warmage edge, plus an additional +1 bonus per four warmage levels. For instance, an 8th-level warmage with 18 Intelligence gets a +7 bonus on the damage dealt by any spell that deals hit point damage.
Normal: A character’s warmage edge is equal to his Intelligence modifier.
Source: Complete Arcane, page 79.