Acidic Slimeburst

You channel ooze magic through you to summon a acidic slime (homebrew creature, CR 5) at a point within range that lasts for the next hour. Immediately after the slime is summoned, each creature hostile creature within 10 ft of it must succeed on a Dexterity saving throw or take 1d4 acid damage and, if the target is wearing nonmagical metal armor, have its armor partly corroded and take a permanent and cumulative −1 penalty to the AC it offers (the armor is destroyed if the penalty reduces its AC to 10). The slime is friendly to you all the time, but is under your control only if you maintain concentration during the duration. If you lose concentration and/or the duration ends, the slime is no longer under your control but is friendly to you and won't attack you. It will, however, not hesitate to attack your allies if angered or hungry.

At Higher Levels. If you cast this spell using a spell slot of 5th or higher, the bursting acid damage from the slime being summoned increases by 1d4 for each spell slot used above 4th.