Acid Blood. A creature that deals bludgeoning, piercing, or slashing damage to the xenomorph while standing within 5 feet of it must make a DC 15 Dexterity saving throw, taking 14 (4d6) acid damage on a failed saving throw, or half as much acid damage on a successful one.

Biomechanical Camouflage. The xenomorph has advantage on Dexterity (Stealth) checks made to hide in mechanical and industrial terrain.

Echolocation. The xenomorph can’t use its blindsight while deafened.

Martial Advantage. Once per turn, the Xenosith can deal an extra 18 (4d8) damage to a creature it hits with a weapon attack if that creature is within 5 ft. of an ally of the Xenosith that isn't incapacitated.

Force Spellcasting. The Xenosith's innate spellcasting ability is Wisdom (spell save DC 18, +10 to hit with spell attacks). It can innately cast the following spells, requiring no material components:

At will: mage hand (hand is invisible, can cast as a bonus action), shocking grasp (30ft range), levitate

3/day each: telekinesis, shield, catapult

Multiattack. The Xenosith makes four Lightsaber attacks, then either makes a bite and two claw attacks, or casts a spell as an action.

Lightsaber. Melee or Ranged Weapon Attack: +11 to hit, reach 5 ft. or range 60 ft., one target. Hit: 17 (2d12 + 4) radiant damage.

Bite. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) piercing damage, 9 (2d8) acid damage and the Xenosith gains 7 temporary hit points.

Claw. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 10 (2d4 + 5) slashing damage.