When you get right to it the difference between fantasy monsters and sci-fi aliens largely comes down to aesthetics.
We’ve talked before about how easy it is to blend sci-fi and fantasy. Older editions of D&D are riddled with examples of either alien spacecraft that have crash-landed on one of D&D’s many worlds, or creatures that roam the stars. But the sword goes both ways – if you want your D&D games to feel a little more sci-fi, these monsters will do handily. Have an alien invasion featuring monsters like these, and nobody will bat an eye…
Chuul
Chuul are fantastic monsters to use in place of aliens. For one, they come from the depths of the ocean, which is basically space anyway if you think about it. But on top of having that “creature” kind of vibe that lends itself to being alien, they also can grapple enemies and potentially stun victims, which feels like a perfect way to lean into alien powers. They could be shock troops leading the charge and abducting victims that the party might have to go rescue.
Nycaloth
Another great source for alien creatures are demons and devils – but you have to look a little far afield to find ones that aren’t obviously infernal. But the same kind of “magic” makes for good like space alien powers. Nycaloths are great, because they are heavy hitters in their own right, but they can also teleport and go invisible as a Bonus Action, which makes sense as a cloaking device.
Purple Worm
Sci-fi loves a big worm. Dune has em. Mass Effect has Thresher Maws. Sci-fi is all about big worms. And that’s why the Purple Worm, D&D’s big worm, is the perfect candidate for a monster that could be an alien.
Thri-Kreen
Thri-Kreen are another great alien analogue. They’re psionically empowered insectoid creatures who have multiple sets of limbs and who wield unique weapons. And while they were originally from the barren world of Dark Sun, they’d be at home on any alien planet.
Umber Hulk
Finally, there’s the Umber Hulk. These behemoth creatures can burrow, see in the dark, and have the ability to confuse and entrance everyone who meets their gaze like some kind of alien predator. Just imagine one of those dropping from low orbit onto a party, and you’ve got a great “close encounter.”
Good luck, and happy adventuring!
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Source: Bell of Lost Souls
