Carian's Withering Vanguard

Make a melee spell attack against a creature that is wearing armor. Until the spell ends, the target's armor is riddled with thorny vines that constrict and cut the target's flesh, beneath their armor, causing them to take 1d4 slashing or piercing damage (your choice). While you maintain concentration, you may use a bonus action to cause the target to take an additional 1d4 slashing or piercing damage (your choice). Whenever a creature takes damage in this way, it may use its next action to make a Strength saving throw against your Spell DC and doff its loosened armor. The spell also ends if you are ever more than 120ft. away from the target or if the target doffs their armor.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d4 and the maximum distance increases by 120ft., for each slot level above 2nd.