Cosmic Breach

A small wormhole to a dimension inhabited solely by monsters is opened before you. Tentacles and tendrils lashes out from it in a line towards a point within 20 ft. Creatures along the line makes a dexterity saving throw. A failed save causes 3d8 of bludgeoning damage and leaves the target stunned. The target may attempt the save again at the beginning of their next turn, but the condition lasts only until the end of their next turn. A successful save causes only half the damage and no condition is applied.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 3d8 for every two slots above 2nd.