Beast of the Alma Mater

Mucous Secretion. A creature that touches the beast or that hits it with a melee attack while within 5 feet of it must make a DC 11 wisdom saving throw. On a failure, the creature suffers from the effects of phantasmal killer.

magic resistance. The beast has advantage on saving throws against spells and other magical effects.

multiattack. The beast of alma mater uses four tongue attacks, two slam attacks or one mucous sling.

Tongue. Melee Weapon Attack: +10 to hit, reach 20 ft., one target. Hit: 8 (1d6 + 5) piercing and 6 (1d10) poison damage.

Slam. Melee Weapon Attack: +10 to hit, reach 15 ft., one target. Hit: 27 (4d10 + 5) bludgeoning damage. 

mucous sling. The beast of the alma mater hovers in the air and fires a ball of mucus from the tip of one of it's tails at a creature within 60 feet of it. The creature must succeed on a dexterity saving throw. On a failed save, it's speed is halved and the creature suffers the effects of phantasmal killer

light roar (recharge 6). The beast of the alma mater emits a beam of highly concentrated light from it's mouth in a 60-foot line that is 5 feet wide. Each creature in that area must make a DC 20 Dexterity saving throw or take 60 (13d8) radiant damage and be blinded until the end of the creature's next turn.