Improved Fortification

(Monster Manual III, page 192, DnD 3.5)

[Racial]

You improve your warforged fortification, gaining immunity to sneak attacks and extra damage from critical hits.

Prerequisite

Warforged, base attack bonus +6

Benefit

You gain immunity to sneak attacks and extra damage from critical hits, but you lose the ability to be healed by spells of the healing subschool.