[zone/client_process.cpp, ~line 1688]
find:
	Code:
		regen = int(level*4/10) + 2;
	regen += spellbonuses.EnduranceRegen + itembonuses.EnduranceRegen;
 add below:
	Code:
		regen += GetAA(aaHeightenedEndurance);
 BEFORE:
	Code:
		regen = (regen * RuleI(Character, EnduranceRegenMultiplier)) / 100;