Starfinder: Xenomorph Trilobite

Chris Van Deelen

Xenomorph Trilobite (Combatant) CR 2 XP 400

Neutral medium aberration

Init +8; Senses Blindsight 120 ft.; Perception +7


Defense                                                             HP 25

EAC 13; KAC 15

Fort +4; Ref +4; Will +3

Defensive Abilities immunities Acid, cold, vacuum

Weaknesses Vulnerability to fire



Speed 30 ft.

Melee Up to four Tentacles +6 (1d6+7 B) or bite +10 (3d4+7 P)

Offensive Abilities Face grab, implant



Str +5; Dex +1; Con +1; Int -4; Wis -2; Cha -2

Skills Acrobatics +7, Athletics +7, Stealth +17

Feats Improved initiative

Languages None

Other Abilities Cling, stalker

Gear None



Environment Any

Organization Solitary


Special Abilities

Cling (Ex) The Xenomorph is able to move its full speed along any surface.

Face Grab (Ex) Like the Facehugger, the Trilobite has only one purpose in its existence – to find a host to implant the Deacon embryo. Unlike the Facehugger, this creature does not seem to care if it is hidden or not. If the creature has successfully grabbed a target with its Tentacle Grab (below), the it will attempt to implant the victim with a Deacon embryo.  The target is then allowed an Acrobatics (escape artists) DC 15 to try and free itself. If this fails, the Trilobite then wraps the tentacles around the body of the target, rendering it unconscious.  It literally engulfs the head of the victim in its mouth in order to enact the actual implantation. This will take 1d20 rounds to complete. Unlike the Facehugger, it will not remain attached to the victim after implantation has been completed.

Implant (Ex) Once a victim has been successfully implanted, the Deacon embryo will continue to grow. It will take as little as an hour or as long as several days before the embryo has grown enough to survive outside the host. At this time the embryo will then tear through the chest of the victim, killing it in the process. Typically the victim will have 4d12 hours before the creature bursts through its chest. If the victim is given medical treatment (actual surgery), the victim has a chance to survive. A surgeon (life science, medicine) will need a successful roll (DC 16) to remove the embryo. If the roll fails, the victim dies in the process.

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

Tentacle 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. The creature will gain a +1 to this attack for every successful strike it gains with a tentacle attack. If the attack roll successfully hits the target’s KAC +4, the creature automatically grapples the foe as a free action. (If it hits the targets KAC +13, it instead pins the target).

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.


This particular type of Xenomorph is used by the Deacon in order to procreate. Unlike the ‘Facehugger’ variant which is quite small in size, the Trilobite is a massive monster and a deadly combatant on its own.

The creature possesses eight tentacle-like limbs, and a powerful jaw. It uses the limbs to grab a possible target to wrap it up for implantation. If a target proves to be too difficult, the creature can use these limbs to crush it to death, or just simply hold onto the target and repeatedly bite until the target is either dead, or compliant enough for implantation.  Each round the Trilobite is capable of striking with up to four tentacles, and once it has at least four attached to the victim, it will attempt to implant the victim with a Deacon Embryo.

Unlike the Facehugger, the Trilobite does not die after implanting the host. Instead it travels about, seeking other hosts to implant.

Oddly enough, this appears to be a dead-end in this particular branch of the Xenomorph family tree. Unlike the typical Xenomorph, which has proven it can adapt to the genetic structure of those who were implanted, only the Deacon is produced, no matter the type of host. The Deacon in turn only produces Trilobites.

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.