The Headhunter’s Coin

Wondrous item, rare (requires attunement)

This silver coin has a skull depicted on one side and a pelvic bone on the other. As an action, you can designate a target creature you can see and flip the coin. Make a flat DC 11 check. If you succeed, your threat range for all attacks you make against the target increase by 2, so a roll of 18, 19, or 20 is a critical hit against the target. A roll of 18 or 19 can still miss, unlike a roll of 20, which is always a hit.

If you fail the flat check, you instead suffer a -2 penalty to your Armor Class.

The bonus or penalty lasts until the target is destroyed or until another creature attunes to the headhunter’s coin.