Gray Ooze

Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) bludgeoning damage plus 7 (2d6) acid damage, and if the target is wearing nonmagical metal armor, its armor is partly corroded and takes a permanent and cumulative -1 penalty to the AC it offers. The armor is destroyed if the penalty reduces its AC to 10.

Melee Attack Roll: +3, reach 5 ft. Hit: 10 (2d8 + 1) Acid damage. Nonmagical armor worn by the target takes a -1 penalty to the AC it offers. The armor is destroyed if the penalty reduces its AC to 10. The penalty can be removed by casting the Mending spell on the armor.

The ooze can move through a space as narrow as 1 inch wide without squeezing.

The ooze can move through a space as narrow as 1 inch without expending extra movement to do so.