Disrepair

You launch a corrosive ball that dissolves metal, wood, stone, and many other materials at a target. If the target is a creature and they fail a constitution saving throw, their AC gets lowered by two until their armor can be repaired, if it can be repaired. If that creature is a medium or smaller construct then they lose 3d10 max hitpoints as well as the AC lost. If that creature is a large construct then they take 3d10 acid damage as well as the AC lost. If that creature is a huge or larger construct then they lose structural integrity causing an effect the DM chooses as well as the AC lost. If the target is a nonmagical tiny or small object, then it dissolves. If the target is a nonmagical medium object then it loses 3d10 max hitpoints. If the target is a nonmagical large nonmagical object then they take 3d10 acid damage. If the target is a nonmagical huge or larger object then is loses structural integrity causing an effect the DM chooses.  Mending reverses this effect on armor if done for an hour.

When cast at levels higher than three, an additional 1d10 is added to damage and max hitpoints lost, and the creature loses 2 more AC per spell level.