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Low-fantasy D&D aliens?
(dice.camp)
This community is for meaningful discussions of tabletop/pen & paper RPGs
Rules (wip):
D&D actually has its own unique space aliens; I've always just used those because everything about space in D&D is gnarly. There are a lot to choose from. Some entirely unique to D&D, others inspired by popular media like the Cthulhu mythos.
For mechs you have all sorts of golems, clockwork/steamwork machines and races like the Warforged.