Re: Heroes vs. Aliens
Depends on the kind of game you want. Are xenomorphs that much more dangerous than some of the classic Dungeon Fantasy monster types? Sure, they'll slaughter a bunch of 5th-level delvers (to use D&D terminology), but so would a typical dragon or a swarm of, say, trolls.
If the DM's bad at judging a challenge (or if they're running the kind of sandbox where the PCs need to balance risk and if they screw up, whoops), any encounter or adventure could be a steamroll. Creating an interesting adventure with xenomorphs is totally possible, though. Heck, you could just straight up adapt the first two movies.
Also, IIRC, Aliens canon has different xenomorph types based on the various hosts for chestbursters. You could have a lot of fun with that - what would a draconic xenomorph be like?
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