Void Eye's

Touch a nearby alley or yourself, they gain the ability for the duration of 1 hour to see all evil alignment creatures as they will gain a dark shadow aura around them that can even be seen at night. The ally or yourself cannot see creatures outside the current plane you reside in, but they can see evil alignment creatures that are invisible within the plane. The player or ally has advantage on investigation checks for the duration of the spell on evil alignment creatures.