Your spells of a particular alignment are more powerful than normal.
Prerequisites: Access to domain of Chaos, Evil, Good, or Law, alignment must match domain chosen, ability to cast 9th-level divine spells.
Benefit: Select an alignment-based domain (Chaos, Evil, Good, or Law) to which the character has access. The character casts spells with that alignment descriptor at +3 caster level.
Special: This benefit overrides (does not stack with) the granted powers of the Chaos, Evil, Good, and Law domains. A character may select this feat multiple times. Its effects do not stack. Each time a character takes the feat, it applies to a different alignment-based domain to which the character has access.
Source: Standard Reference Document under Open Game License v1.0a, which updated this feat originally published in the Epic Level Handbook, page 57.