Re: Elder Things in Spaaaaace!
Doesn't sound like anything needs to change. Just say they are part of the material plane, but instead of being measured in x,y,z coordinates they are measured in weird,unearthly, eldritch. They work on blue vs orange morality (tv tropes). They are visible and tangible, but move through our space without being part of it.
Standard GURPS rules still apply.
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