Bloodstriker

Caustic Blood. Any creature that hits the bloodstriker with a melee attack within five feet must make a DC 16 dexterity saving throw or take 4 (1d6) acid damage from the dinosaur's highly acidic blood.

Charge. If the bloodstriker moves at least 10 feet straight toward a target and then hits it with a gore attack on the same turn, the target takes an extra 9 (2d8) piercing damage. If the target is a creature, it must succeed on a DC 16 Strength saving throw or be pushed up to 10 feet away and knocked prone.

Spiked Skin. A bloodstriker's thick skin bristles with defensive spikes. A creature that hits a bloodstriker with a melee attack takes 9 (1d4+6) piercing damage.

Underground Camoflague. The bloodstriker has advantage on Dexterity (Stealth) checks made to hide while burrowed.

Bite. Melee Weapon Attack: +9 to hit, reach 10 ft., One target. Hit: # (2d6 + 6) piercing damage and 1d6 acid damage.  

Bloodsquirt (Recharge 5-6).  As an action, the bloodstriker can project a 30-foot line of acidic blood. Anyone in the area must make a DC 16 Dexterity Saving Throw. On a failure they take 2d6 acid damage or half as much on a success.