The caster says "revive darkness" (in their desired language) and waves their hand towards a shadow. From the darkness climes, skeletal hands. They claw from the shadows. Slowly revealing a creature that looks truly evil. All who can see it, see a Skeleton rising from the shadows.

The Skeleton will do your bidding for as long as they exist, and they can't be charmed. The Skeleton will sink into the ground when Dispelled.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, you create 2 more creatures.