Your rage becomes even more powerful than normal.
Prerequisites: Str 21, Con 21, greater rage class feature, rage 5/day.
Benefit: When the character rages, he or she gains a +8 bonus to Strength and Constitution and a +4 morale bonus on Will saves. (These bonuses replace the normal rage bonuses.)
Source: Standard Reference Document under Open Game License v1.0a, which updated this feat originally published in the Epic Level Handbook, page 63.