Gem of Seeing

[ Gemme de vision ]
Wondrous item, rare (requires attunement)
This gem has 3 charges. As an action, you can speak the gem's command word and expend 1 charge. For the next 10 minutes, you have truesight out to 120 feet when you peer through the gem.
The gem regains 1d3 expended charges daily at dawn.
Dungeon MasterĀ“s Guide (SRD) D&D 5 › Magic Items