Azrebeck

Seed Release. As a bonus action they can release a cloud of seeds. Every creature in a 15-ft radius must make a Con save (16 DC). On a fail they are infected by the seeds and they will slowly grow another Azrebeck inside them. For every week they are infected they subtract 10 hp from their max when they drop to 0 hp they are overcome by the seeds and transform into a Azrebeck. This can only be reversed by the wish spell, greater restoration, or remove curse. 2/day

Burrow. As a defense it can disappear below the surface reappearing in any unoccupied square in its range (30ft).

Tentacle. Melee Weapon Attack: + 5 to hit, reach 10 ft., 1 target. Hit: 7 (2d8 + 3) bludgeoning  damage. 

Poison Gas. It releases a spray of secondary spores causing each creatures in a 30-ft radius to make a Con save (16 DC). On a fail they take 27 (5d8 + 4) Poison damage.