Broken Ring of Libra (5e Equipment)

Ring, very rare (requires attunement)

This dark black ring will always somehow stay on your finger, but once it is removed, it will break in half. While wearing it, you gain a +1 bonus to AC, and at the beginning of each of your turns, you either gain or lose 1d4 hit points, until your current hit points are equal to half of your hit point maximum. You don't gain hit points while at 0 hit points. This ring can only be attuned to once every 24 hours.