Urushi Constrictor

Jungle Camouflage. Has advantage on Dex (Stealth) checks made to hide in jungle terrain.

Poisonous Leaves. Its skin is embedded with vines and poisonous leaves that burn on contact. A non-Construct or Undead creature that touches the constrictor or hits it with melee attack while within 5 ft. of it takes 7 (2d6) poison.

Urushi Blight. A creature infected with this disease manifests symptoms within 1d4 hrs which includes gradual spread of painful itchy rash that develops into inflamed and blistered skin during 1st day. Until disease is cured infected creature: disadvantage on Con saves to maintain concentration on a spell and disadvantage on Dex and Cha saves and ability checks. At end of each long rest infected creature: DC 15 Con save. If it succeeds on two saves it recovers.

Multiattack. 2 Bites or 1 Bite and 1 Poisonous Constriction.

Bite. Melee Weapon Attack: +6 to hit, 10 ft., one creature,. 14 (2d10+3) piercing damage.

Poisonous Constriction. Melee Weapon Attack: +6 to hit, 5 ft., one creature,. 12 (2d8+3) bludgeoning damage and target is grappled (escape DC 15). Until this grapple ends target is restrained and takes 10 (3d6) poison at start of each of its turns and snake can't use Poisonous Constriction on another target. Each time target takes this poison it must make DC 15 Con save or contract urushi blight.