Ergon's Chaotic Sword

You conjure a greatsword of arcane energy and can make a melee spell attack against one creature within range. On a hit, the target takes (1d4)d6 force damage. On a successful hit, if the target is casting a concentration spell, they must succeed on a Concentration saving throw or lose control of the spell. The target roles on the Wild Magic table in the Player's Handbook to determine the outcome.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the force damage increases by 2d6 for each slot level above 3rd.