Iron Halo

Metal fragments orbit around you. Attacks made with metal weapons or projectiles against creatures of your choice in the emanation have disadvantage. As a bonus action, make a ranged power attack against one creature within 60 ft.; on a hit, it takes 18 (4d8) piercing damage.

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