Aligned Devotion (3.5e Flaw)
From D&D Wiki
Your healing powers are only as effective for those whose alignment closely matches yours. prereqs=Ability to spontaneously cast cure spells.
Effect: Healing spells have reduced effect on those who don’t share your alignment. Those that match your alignment exactly receive full benefit, those that are one step away are cured half the normal and all others gain no benefit from your healing at all. Your cure spell still does full damage to undead.