The Gateway Bestiary I have is an old RQ II suppliment. It wouldn't be bad if you want to transfer a couple of rules over (shouldn't be to hard). In the Celtic part it includes Barguests, Brollachans, Fachans, Kelpies, Nuckelavees, Redcaps, Stoorworms, Water-leapers and Voughs. A lot of these have been reprinted in other places though. Can prove to be a handy book but I think it tends to be a little expensive on E-bay.
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