Aerenal Half-Life

Heroic Tier
Prerequisite: Elf, Aerenal background
Benefit: You gain a +1 feat bonus to damage rolls with necrotic powers. The bonus increases to +2 at 11th level and +3 at 21st level.
In addition, when you spend an action point to take an extra action, you also gain this bonus to attack rolls with necrotic powers until the end of your next turn.

Published in Eberron Player's Guide, page(s) 87.