Rings of Mylott (5e Equipment)
From D&D Wiki
Ring, Very Rare (attunement required)
A set of almost identical rings, the color of glazed over obsidian with markings of CO22H2A on the inside of the left ring and CH2O2AH2O on the inside of the right.
Mylottism. As an action, every humanoid and non-humanoid alike that have the wearer within sight must make a DC 15 Wisdom saving throw or fall under the effects of the cantrip friends. If the character succeeds the save, there is no effect. Magic from the rings are undetectable unless the rings are the target of a detect magic cast at 6th level, the spell may be removed from a creature from a 6th level dispel.