Water Sense. If there is water within 120 feet of the Vile Behemoth, then it knows where the water is. Vile Behemoth gladly leads friendly creatures and players to water sources.

Drain Essence. The Vile Behemoth draws the essence of those around it into the bushes on its back, empowering both them and the beast. The Vile Behemoth chooses 5 creatures within 30 feet of itself. Each creature makes a DC12 Constitution saving throw. On a failure, the creature takes 1d6 poison damage. The Vile Behemoth gains temporary hit points equal to the amount of poison damage dealt using this ability. The  dinosaur cant use Drain Essence again until after a short rest.

Tail Swipe. Melee Weapon Attack: +8 to hit, reach 15 ft., one target. Hit: 32 (6d8 + 5) bludgeoning damage. 

Poison Leaf Breath. The Vile Behemoth exhales a barrage of leaves coated in poison gathered from within its bushes, set atop the dinosaurs shell. The leaves strike all targets within a 60 foot cone. Any creatures in that area must make a DC15 Constitution saving throw, taking 36 (8d8) poison damage on a failed save, or half as much on a successful one. The Vile Behemoth can only use this attack after it has gained 18 temporary hit points using its Drain Essence trait.