Acid Blood. The blood of the Xenomorph is acid and can make anything melt.

Tactical Movement.  The Xenomorph can move in every way except for flying, if it forces a face hugger down an angels throat, it will cause the Xenomorph that bursts out to have wings.

Call Swarm. The Xenomorph calls out to get help, atleast 10 new Xenomorphs are guaranteed to come, the amount can be more.

Tail Slash. Melee Weapon Attack: +6 to hit, reach 10 ft., 3 target. Hit: 20 (5d4 + 12) slashing damage. 

Face Hugger. RangedWeapon Attack: +7 to hit, range 10/250 ft., 1 target. Hit: 60 (3d20 + 20) acid damage.

Impregnate. When the Xenomorph reaches low health it will force a face hugger down the opponent's throat and later the face hugger will burst out of the opponent's stomach, birthing a nex Xenomorph, the baby will feast on it's host.