So, i am currently at the moment working on bringing everyone's favorite jet black killing machines into the starfinder universe, a.k.a., the Xenomorphs. Not as a playable species but as a monster group to be fought against. So far, i have managed to do some work on Face Huggers, the beginning of the Xenomorph Life Cycle. As this progresses, we shall see in what direction I take all of this. Below, is a stat block I thought up while watching Alien. Suggestions are welcome.
Face Hugger
CR 1/2
XP 200
CN Tiny aberration (native)
Init +3; Senses darkvision 60 ft., blindsense 60 ft.; Perception +4
DEFENSE
HP 12
EAC 10; KAC 11
Fort +2; Ref +2; Will +3
Weaknesses Extreme Temperature Change
OFFENSE
Speed 50 ft., climb 20 ft.
Melee tail wrap +5 (1d4+NaN B; critical grapple)
Space 2-1/2 ft.; Reach 0 ft.
TACTICS
The Face-Hugger will often move in close with Stealth before attempting to make an attack, and will often use Athletics or Acrobatics skill checks to maneuver themselves into a favorable position
STATISTICS
Str +2; Dex +3; Con +0; Int +1; Wis +0; Cha +0
Skills Acrobatics +9, Athletics +4, Sense Motive +4, Stealth +9, Survival +9
SPECIAL ABILITIES
Constructed (Ex) For effects targeting creatures by type, synthetic creatures count as both their actual creature type and constructs (whichever type allows an ability to affect them for abilities that affect only one type, and whichever type is worse for abilities that affect both creature types). They receive a +2 racial bonus to saving throws against disease, mind-affecting effects, poison, and sleep, unless those effects specifically target constructs. In addition, synthetic creatures do not breathe or suffer the normal environmental effects of being in a vacuum.
Grab (Ex) If the creature hits with the indicated attack (usually a claw or bite attack), it deals the normal damage. If the creature's attack roll successfully hits the target's KAC + 4, the creature also automatically grapples the foe as a free action. (If it hits the target's KAC + 13, it instead pins the target.) The creature does not need to have a spare limb free to perform this grapple, as long as it can make the listed attack, and it can potentially grapple more than one target if it has more than one attack with the grab ability. The creature can maintain the grab either with another successful grab attack or by performing the grapple combat maneuver normally.
Implant Embryo (Ex) Upon a successful Grapple Combat Maneuver, the Face Hugger can attempt to implant an Embryo into the body of their target. Once implanted, the embryo incubates within the host for 1d8+1 hours, and the host recieves 1d6 points of damage until the the stamina of the host reaches 0, at which the point the embryo becomes a Chest Burster and erupts from the chest of the host, instantly killing the host.