Aberrant Form. The Xenodragon's type is Dragon/Aberration.

Lurker in the Shadows. The Xenodragon has advantage on Stealth while within Darkness or Dim Light. While within Darkness, the Xenodragon also gains +7 to it's Stealth check.

Ambush Predator. If the Xenodragon attacks a surprised Creature and hits it with an attack during the first round of combat, it deals an additional 2d6 damage with each attack.

Acid Blood. Whenever the Xenodragon takes damage aside from Psychic or Fire, each creature within 5ft. of the Xenodragon must make a Dexterity Saving Throw DC 16, taking 9 (2d8) Acid Damage on a Failure.

Amphibious. The Xenodragon can breathe air and water.

Multiattack. The Young Xenodragon makes either 2 attacks with it's Claws and 2 attacks with it's Vestigial Claws or one attack with it's tail and one with it's bite.

Claws. Melee Weapon Attack: +9 to hit, reach 5ft. one target. Hit: 12 (2d6+5) slashing damage. A large or smaller Creature hit by this attack becomes Grappled (escape DC 16) by the Xenodragon. A Creature Grappled in this way is also Restrained. For each Creature the Xenodragon has Grappled, it loses one Claw attack from it's Multiattack.

Vestigial Claws. Melee Weapon Attack: +6 to hit, reach 5ft. one target. Hit: 4 (1d4+2) slashing damage.

Bite. Melee Weapon Attack: +11 to hit, reach 5 ft., one Grappled target Restrained by the Xenodragon. Hit: 65 (10d10 + 10) piercing damage.

Tail. Melee Weapon Attack: +9 to hit, reach 15ft. one target. Hit: 6 (2d8+5) piercing damage.