Most beasts, plants, many monstrosities, and even some undead creatures from the Monstrous Menagerie are appropriate for use and make excellent challenges for voidrunners. The list below contains a selection of non-spellcasting creatures which can be used without any changes.

Of course, if your universe contains magical and fantasy creatures, then the whole of the Monstrous Menagerie is a vital resource, and your voidrunners can battle dragons on alien planets and wizards on ancient space stations. Alternatively, magical creatures make for excellent ‘omnipotent’ beings or aliens with exotic powers–many science fiction franchises play with the idea of mythology as unexplained science. Perhaps lycanthropy is a known medical condition, a specter is a lingering psychic imprint, or ‘magic’ comes from another dimension.

Lore. Where a monster’s entry contains Arcana as a lore skill check, use Science instead.

Appearance. You may wish to alter a creature’s name or appearance from the standard Monstrous Menagerie entry–a T-rex may be some kind of fearsome alien lizard, and a wolf may have fangs and a hairless hide.

Magic vs. psionics. Magical abilities can be re-skinned as psionics.

Monsters usually encountered in space (those with a speed listed as Spacefaring Slow, Spacefaring Average, or Spacefaring Fast) are typically more powerful than terrestrial monsters of the same challenge rating. These cosmic threats are strong enough to match a party’s ship, not merely the party itself.

Spacefaring monsters of CR 3 and below have similar statistics to standard (non-spacefaring) monsters. For a battle in which a party must face a CR 4 or higher spacefaring monster without the benefit of a starship, triple the spacefaring monster’s XP and treat it as 3 standard monsters of its Challenge Rating for purposes of encounter building. For a battle in which a starship battles a CR 4 or higher standard monster, grant ⅓ of the monster’s XP and treat it as a monster of ⅓ its CR for the purposes of encounter building.