Amulets of balance are rather rare items that, when worn, reduce the impact chaotic or lawful deeds have on your alignment, but only if you are neutral. An amulet of balance will not impact alignment on its own, and will not damage chaotic or lawful players who wear it. A blessed amulet will divide alignment impacts by 8, an uncursed amulet by 4, and a cursed one will halve them.