Xenomorph Soldier

Acid for blood. Any creature within 5ft. of the xenomorph when it takes damage is sprayed with acidic blood and must make a DC14 DEX saving throw. On a failure, the creature takes 4 acid damage (or half as much on a successful save).

Any non-magical weapon made out of metal or wood corrodes when dealing slashing or piercing damage against the xenomorph. After each instance of damage, the weapon takes a permanent and cumulative -1 penalty to damage rolls. If the weapon's penalty drops to -5, the weapon is destroyed. The penalty can be removed only by magical means (i.e., mending or prestidigitation), costing 1 full action. Non-magical ammunition that hits the xenomorph is destroyed after dealing damage.

Hive tactics. The xenomorph has advantage on attack rolls when it is within 5ft. of a member of its hive that isn't incapacitated.

Natural Stealth. The xenomorph has advantage on DEX (stealth) checks when in dim light or darkness.

Multi-attack: The xenomorph has two attacks.

Claw Attack. Melee Weapon Attack: +5 to hit, reach # 5ft., one target. Hit: 8 (1d10 + 3) slashing damage. 

Tail Attack. Melee Weapon Attack: +5 to hit, reach # 10ft., one target. Hit: 8 (1d10 + 3) piercing damage. 

Surprise Grapple. As a bonus action, the xenomorph can lunge at a target and attempt to grapple it.

Little mouth. As a bonus action, the xenomorph can bite a target they've grappled. +5 to hit, one target. Hit: 6 (1d6+3) piercing damage.

Stealth adept. The xenomorph can take the hide action as a bonus action, and has advantage on stealth checks in dim light or darkness.

Attack of Opportunity. The xenomorph makes an opportunity attack when a creature leaves its melee range (10ft.)

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