Surge the Weave

The weave surges at the target area and causes wild unstable magic to form. Each creature in a 20-foot-radius sphere centered on that point must make a Wisdom saving throw or take 4d6 Force damage or half as much on a successful save. Failing the saving throw causes a target to become unstable.

The next spell that hits a target under the unstable effect triggers a Wild magic surge, after which the unstable effect is removed.

If the Target casts a spell while under the effect of this spell, they must make a check with their spellcasting modifier against the casters spell save DC. Failing the check causes the Target to take Xd4 force damage. X being the Spellslot level the Target expends. Casting a cantrip causes 0d6 and removes the unstable effect.

The unstable effect fades at the end of the turn of one under it's effect.

At Higher Levels: When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.