Ring of Darkness (4e Equipment)
From D&D Wiki
|Ring of Darkness||Level 6 Rare|
|A silver ring with a black opal.|
|Power ♦ Encounter (Minor Action)|
|Effect: You gain an aura 1 until the start of your next turn. Squares in the aura are filled with magical darkness, providing total concealment.|
Milestone: If you have reached at least one milestone today, the aura lasts until the end of your next turn.