Actions/Abilities/Traits: (D&D 5e)
Action
Bite
Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 22 (3d10 + 6) piercing damage and the target is grappled (escape DC 16), and the gnasher lizard can only grapple one creature at a time.
Action
Thrash
The gnasher lizard rapidly shakes its head, and any grappled target takes 39 (6d10 + 6) slashing damage. If this damage is enough to drop the target to 0 hit points, the target is dismembered and portions of it are swallowed. A creature who suffers this cannot be brought back to life with anything less than true resurrection.
Special
Surprise Attack
If the cavern lizard surprises a creature and hits it with an attack during the first round of combat, the target takes an extra 14 (4d6) damage from the attack.