Strange Geometry

For the duration, the area in a 30-foot radius sphere around you is warped by the intrusion of extradimensional geometry. The radius moves with you.

Within the affected area, you and the creatures you designate when you cast this spell can use a bonus action on their turns to teleport up to 10 feet to an unoccupied space that they can see. Additionally, the reach of your melee attacks increases by 5 feet.

Hostile creatures treat the affected area as difficult terrain. Additionally, when a hostile creature enters the affected area for the first time on a turn or starts its turn there, the creature must succeed on an Intelligence saving throw or take 1d10 force damage and be teleported 10 feet in a random direction.