Epic Toughness

 
Prerequisite(s): 21+ Character level, Spellcraft 24+ ranks, Knowledge (Arcana, OR Religion, OR Nature) 24+ ranks, ability to cast 9th level divine or arcane spells (depends on class).
 
Benefit: The character gains +30 hit points.
 
Special: A character can gain this feat multiple times. Its effects stack.
 
Source: Epic Level Handbook