Dungeon Fantasy: Beastmen

[demonsbane]

Dimension travel would be (and it is!) definitely Ok, if it doesn't means parallel worlds. Otherworlds and different dimensions are definitely necessary. "Yetzirah" or the psychic domain "high in the atmosphere" above "the corporeal world" (Assiah) already includes any imaginable "dimensions" (excepting "alternate earths") for the fantasy roleplaying point of view. Characters only need Jumper (Spirit) -see Powers- instead Jumper (World), or gates enabling the benefit of the advantage. Projection also can be useful for this purpose. GURPS has the tools.

However, wait for a better and -I hope- somewhat more useful answer about this, what I should be able to provide once we are in this point of the discussion. Maybe in a few days.