Mummy Lord Ascendant

Become an apex mummy. You are immune to poison and necrotic damage, resistant to radiant and nonmagical weapon damage, and your Mummy's Curse powers deal or prevent extra damage once per turn. Creatures that fail saves against your curses cannot regain hit points until the start of your next turn.

This power has its own stable page so it can be linked from any character, item, location, story post, bargain, curse, or future reward.