Dance of The Dead (Dancing Skeletons)

Bones rise from the ground and begin twirling and dancing. Choose a 15×15 foot space within 60 ft for the bones to waltz, anyone in that square must make dexterity save (based of spellcasters save dc) or take 1d6 bludgeoning dmg. The skeletons last there until your next turn, and the square counts as difficult terrain.

The spells dmg and range increase at 5th level (2d6 20x20 feet), at 11th level (3d6 25x25) and at 17th level (4d6 30x30)