Mortifera

Amphibious. Can breathe air and water.

False Appearance. While motionless indistinguishable from bed of lotus flowers.

Magic Resistance. Advantage: spell/magic effect saves.

Poisonous Tendrils. A creature that starts its turn grappled by the mortifera must make DC 15 Con save or be poisoned for 1 min. A poisoned creature can re-save at end of each of its turns success ends effect on itself.

Multiattack. One Fanged Tentacles and two Slams or it makes three Slams. It can replace two Slams with Chomp.

Fanged Tentacles. Melee Weapon Attack: +7 to hit, 10 ft., one target, 9 (2d4+4) piercing damage + 9 (2d8) poison and target is grappled (escape DC 15). Until the grapple ends the target is restrained and mortifera can't use its Fanged Tentacles on another.

Slam. Melee Weapon Attack: +7 to hit, 5 ft., one target, 10 (1d12+4) bludgeoning damage.

Chomp. One creature grappled by mortifera is pulled up to 5 ft. to mortifera's central maw which chomps on creature. Target: 10 (3d6) piercing damage and 13 (3d8) poison (DC 15 Str half).

Poison Spray (Recharge 5-6). Sprays poison from its central maw in a 30' cone. Each creature in that area: 27 (6d8) poison (DC 15 Dex half).