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Aliens is a bestiary of 100 ready-to-run adversaries for Galaxium—hostile life, boarders, infiltrators, predators, engineered war-beasts, rogue constructs, and other threats tuned for the science-fantasy adventure and cosmic horror tone Galaxium does best. Every creature is built to do a job in play, whether that job is bleeding a crew’s resources across a long sortie, turning a clean fight into chaos, or anchoring an entire mission as the “thing in the dark” your players won’t forget.
Each entry gives you what you actually need at the table: a tight, usable description that tells you what the creature is, what it wants, and how it behaves, followed by a complete statblock formatted for fast reference—defenses, initiative, hit points, movement, key traits, and the actions (plus bonus actions, reactions, and legendary actions when applicable) that define its tactics. Creatures are presented alphabetically so you can grab a threat on short notice, read one paragraph for intent, then run it immediately as written.
Use these adversaries as simple drop-ins, as ecosystem pieces, or as recurring signatures of a larger threat: security for a facility, predators in a debris field, infestations in maintenance shafts, or deniable assets hired to sabotage a ship from the inside. If you want a taste of the range, you’ll find foes like the Arcforge Saboteur, the Veilsong Impostor, the Vacuum-Wight Corsair, and apex threats like the Voidscale Hydra and Starvein Apex Horror.
For encounter building and quick selection, the appendices list every creature by creature type and by Challenge Rating, covering CR 1/2 through 19. Many adversaries are designed to feel unfamiliar, unfair, or terrifying on first contact—best used with clear warning signs and meaningful choices that let the crew learn the galaxy’s rules the hard way.