Botanic Undead

Botanical Skin. While the creature remains motionless, it is indistinguishable from a tangle of vines. 

Overgrowth. A 30ft radius around the undead is difficult terrain caused by overgrown vines and thick underbrush.

Undead Fortitude. If damage reduces the undead to 0 Hit Points, it must make a Constitution saving throw with a DC of 5+the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead. 

Multiattack. The undead may make 2 attacks per turn.

Constrict. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 9 (2d6 + 2) bludgeoning damage, and a Large or smaller target is grapled (escape DC 13). Until this grapple ends, the target is restrained, and the undead can’t constrict another target. Any breathing creature may only breathe  5 rounds (30 seconds) in this condition before falling unconscious from suffocation.

Entangling Plants (Recharge 5–6). Grasping roots and vines sprout in a 15-foot radius centered on the blight, withering away after 1 minute. Each creature of the blight’s choice in that area when the plants appear must succeed on a DC 12 Strength saving throw or become restrained. A creature can use its action to make a DC 12 Strength check, freeing itself or another entangled creature within reach on a success. 

Vines. Ranged Attack: +6 to hit, range 40ft, one target. Hit: 9 (2d6+4) bludgeoning damage. If the target is size Medium or smaller, it is pulled 10 ft and is grappled (escape DC15) if the undead is not already grappling a creature.

Slash. Melee Weapon Attack: +8 to hit, range 5ft, one target grappled by the undead. Hit: 18 (3d8+4) slashing damage and 4 (1d6) poison damage.  

Regrowth. As a reaction, the undead can regrow any missing limbs or may mutate to grow additional ones. 1 per round, maximum of 3 additional limbs. Each additionally grown limb beyond two arms and two legs the creature grows will get an additional attack. Regrown limbs do not add attacks.