Hmm there's tons of beastiaries on the net but i don't know where. There are a few tolkien ones i know of so try searching in that direction. As for Forgotten realm monster manuals i can't help you there sorry
. Ask Memnoch he should know. Getting your hands on Balders Gate 1 and 2 and Pools of Radiance 1 and 2 could help. Also the forgotten realms books can help.
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ShadowMaster of the Theives of Darkness. I'm also an ice cream man!