Starfinder: Xenomorph Crustacean

Chris Van Deelen

Xenomorph Crustacean (Combatant) CR 5 XP 1,600

Neutral medium aberration

Init +2; Senses Blindsight (sound) 60 ft.; Perception +0


Defense                                                             HP 70

EAC 21; KAC 23

Fort +7; Ref +7; Will +6

Defensive Abilities Acid blood, acid splash, Improved Armor (Ex) ; immunities Acid, cold, vacuum

Weaknesses Vulnerability to fire



Speed 30 ft.

Melee Bite, +14 (1d6+11 P) or four claws +10, (2d4+11 plus grab S), or one tail +14, (1d10+11 P)

Ranged Acid-coated pellet +11 (see description)

Offensive Abilities Acid-coated pellet, grab, inner jaw



Str +6; Dex +2; Con +2; Int -4; Wis -2; Cha -2

Skills Acrobatics +11, Athletics +16, Stealth +16 (+21 in hive)

Languages None

Other Abilities Stalker

Gear None



Environment Any

Organization Solitary or small groups (1d4)


Special Abilities

Acid blood (Ex) The blood of the Xenomorph is highly acidic. Whenever it bleeds, the blood will burn through almost any substance and will cause 1d6+5 points of damage. The blood will continue to burn for 1d6+6 rounds, causing damage each round. Attacking the Xenomorph with natural weapons is a very poor idea.

Acid-coated pellet (Ex) This particular version of the Xenomorph is able to shoot a single pellet of hive material. The pellet has a range of 75 feet, and inflicts 1d8+5 P piercing damage, but also will inflict 1d6+5 points of acid damage every round after the initial round for 1d6 rounds. This additional damage can be negated with a successful Fort save (DC 13). If the attack is a critical, then no saving throw for the acid is allowed.  The creature can use this attack only once every second round.

Acid Splash (Ex) Whenever the Xenomorph is hit by any type of attack which deals more than 10 points of damage in a single strike, the blood will have a chance to effect anyone near. The acid splash has a radius of 20 ft. and those caught in the area of effect are allowed a Ref save (DC 13) to avoid taking damage. If the save fails, the victim will suffer 1d6+5 points of damage per round, for 1d6 rounds.

Grab (Ex) When the Xenomorph happens to be within range of a hive, it will often attempt to grab and drag a victim back to the hive to be cocooned and impregnated. The creature must make a claw attack, it will do normal damage. If the attack roll successfully hits the target’s KAC +4, the creature automatically grapples the foe as a free action. For each claw that successfully hits, the KAC to pin drops by 2, so if all four claws hit, then the creature only needs a KAC +5 to pin, instead of +13. The victim can attempt to break free while grappled, requiring a successful escape (using the acrobatics skill). If the victim turns out to be ‘troublesome’ the creature can opt to bite in order to make the target more ‘compliant’.

Improved Armor (Ex) The armor is significantly thicker and stronger than those of other Xenomorphs, and as such they gain a +4 to both EAC and KAC.

Inner Jaw (Ex) Possessing an additional ‘jaw’ the creature can opt to use this attack. It typically will use this on a grappled target, or it can opt to use this in addition to the bite. The bite does slightly less damage (1d6+11 S) but is more accurate. The creature has a +17 with this particular attack, and if the target is grappled, then the bonus is +20.

Natural Weapons (Ex) Cannot be disarmed.

Stalker (Ex) The Xenomorph is a near-perfect predator. As such it gains a +5 racial bonus to stealth rolls, and whenever the creature is in a hive, this bonus increases to +10

Vulnerability to fire (Ex) The creature has few vulnerabilities, and fire is one. Whenever it encounters fire, the creature will take an additional 50% damage (rounded to nearest) and suffer a -4 to any saving throws involving fire.


Certain planets are known for having large crustacean’s life-forms. As is the case with the Xenomorphs, they were able to successfully implant an embryo and it adapted the creature’s genetic code into its own.

The resulting Xenomorph has the overall shape of a crab, and instead of two arms and legs, it has four of each. This Xenomorph looks more like a centaur than the others of its species, and it is significantly stronger than most, but not quite as dextrous and not as fast as some of the known variants.

Like other variants, the origin of the species is obvious – it has the elongated cranium, the inner jaw, the tail, and the bio-mechanical appearance. The exoskeleton of the creature is thicker and provides better protection against attack than the other variants as well.

In combat, the creature is an absolute nightmare. It can attack with all four claws at once and is far more adept at grabbing and holding victims than other variants, but unlike most other variants, it does not attempt to incapacitate, instead it will simply kill and begin to feed off the target.

Out of all the variants, this is one of the very few which are capable of attacking at a range. They have a pair of ‘plates’ on their chest, which can open and using the musculature beneath, fire heavy shards of solidified resin coated in the same acidic blood they use to live. The resin is the same compound as used in the construction of the hive.

This alone makes these creatures even more dangerous than the Spitter variants.

When attached to a particular hive, these variants are used most often as ‘shock troops’, sent in to deal with potential threats, and occasionally they will be found in the presence of Praetorian guards, although for some reason they are never allowed directly into the egg chamber or allowed to be near the queen.

Something about snacking on eggs and Face huggers.

Furthermore, the creature is perfectly at home in the water, and is able to use its full movement rate without penalty.

Starfinder Creature Index

Chris Van Deelen is the creator and contributor to over half of the Wisdom from the Wastelands series, contributor to the Swords of Kos: Hekaton anthology. He also wrote Creatures of the Tropical Wastelands, and 100 Oddities found in a Car. As prolific as he is, Chris Van Deelen continues to write and produce material which will be in publication soon. Not only is he a prolific content creator, he also has a wide selection of fiction and stories! If you like his work, please follow his personal author page on Facebook and on Twitter to keep up with his latest news and game content.