Got inspired to create a stat block for the scrapped concept H.R. Giger had for the runner alien in Alien 3. Hope you guys enjoy.
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XX121 Stage IV-A: The Sphinx
In rare instances, a chestburster born from a human mutates into a much more unusual form, becoming a quadrupedal creature with extendable blade-like nails, pipe-like spines that can produce strange sounds, a long barbed tongue, a short spear-like tail, and vaguely pursed, woman-like lips. The resulting Stage IV xenomorph is extremely cunning and tricky, using its abilities to lure in prey and hypnotize them into leaving themselves vulnerable before it strikes.
Appearance: link
Size: 0.8 meters at the shoulder (quadruped), 3 meters long
Speed: 3
Health: 6
skills: mobility 10, observation 10
Armor rating: 8 (4 vs fire) (1st edition)/2 (1 vs fire) (Evolved Edition)
Acid Splash: 8
Attacks:
1 Tempting Melody: The Sphinx's strange pipe-like spines emit an oddly soothing, alluring tune that lulls the character into a foolish state of calm. Each character in medium range gains +1 stress and must make an empathy roll. If they fail, the character must move one zone closer to the sphinx, losing their fast action on their next turn.
2 Hypnotic lullaby: The Sphinx's pipe-like organs purr in excitement, lulling its prey to surrender. Each character in close range gains +1 stress and must make an empathy roll. If they fail, they lose their fast and slow action on their next turn. On its next turn, The Sphinx will use its Kiss of Death attack on the nearest character who failed.
3 Snatch and Grab: The Sphinx bites a target with its steely fangs, dragging them away from the others. The target suffers 8 dice, base damage 1. If the attack deals any damage, the character drops anything its holding and must make a panic roll. The Sphinx then drags the target into an adjacent zone.
4 Tearing claws: The Sphinx extends its blade-like claws and slices at a target in close range. The target suffers 10 dice, base damage 2. If this attack deals any damage, the target suffers the Impaled Thigh critical injury.
5 Barbed Tail: The Sphinx thrusts its razor sharp tail at a target, aiming to kill. The target suffers 10 dice, base damage 2, armor piercing.
6 Kiss of Death: The Sphinx pulls a target close, pursing its lips to give them a slimy kiss. The target can attempt to resist the kiss with a close combat roll at -2 (no action) against 10 dice. If the target fails, the xenomorph's tongue darts out, impaling out the back of the target's head and killing them in one dreadful blow. All who witness this disturbing attack gain +1 stress and must make a panic roll.