9 (natural armor)
138 (12d12+60)
walk 30 ft., climb 30 ft.
Int +7, Wis +4
Arcana +7, Insight +4
lightning, necrotic; bludgeoning, piercing, slashing from nonmagical attacks
acid, cold, poison
blinded, charmed, deafened, exhaustion, frightened, paralyzed, poisoned, prone
blindsight 120 ft.
Common, Primordial, Thayan
10
A creature that touches the Ooze Master or hits it with a melee attack while within 5 feet of it takes 9 (2d8) acid damage. Any nonmagical weapon that hits the Ooze Master corrodes. After dealing damage, the weapon takes a permanent and cumulative −1 penalty to damage rolls. If its penalty drops to −5, the weapon is destroyed. Nonmagical ammunition that hits the Ooze Master is destroyed after dealing damage. The Ooze Master can eat through 2-inch-thick, nonmagical wood or metal in 1 round.
When the Ooze Master casts a spell with a casting time of 1 action, it can make one pseudopod attack as a bonus action.
The Ooze Master can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
The Ooze Master is a 9th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 15, +7 to hit with spell attacks). It has the following wizard spells prepared: • Cantrips (at will): acid splash, friends, mage hand, poison spray • 1st level (4 slots): charm person, detect magic, magic missile, ray of sickness • 2nd level (3 slots): detect thoughts, Melf's acid arrow, suggestion • 3rd level (3 slots): fear, slow, stinking cloud • 4th level (3 slots): confusion, Evard's black tentacles • 5th level (1 slots): cloudkill
Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 13 (3d6 + 3) bludgeoning damage plus 10 (3d6) acid damage.