For players contemplating or already playing goblin PCs.
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You can join the goblin town usergroup via this link:
http://www.escapefromunderdark.com/forums/groupcp.php
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You can get cool goblin portraits and voice sets that other players can see and hear from this tutorial:
http://www.gamefaqs.com/computer/doswin/file/188666/18642 (Some of the links and tools mentioned in this tutorial are outdated, but the instructions are essentially good otherwise. You'll need a different extractor than the one mentioned in the article to do it manually, or you can just grab the files as linked below.)
*Update 2/24/2008*
Here are two direct links to the data files for voices and portraits (I have not checked them.):
Portraits and Voice Sets
http://nwvault.ign.com/View.php?view=Hakpaks.Detail&id=2056 (I believe there's also a faulty instruction here that tells you to put portraits in the override directory. Instead, I make a directory labeled portraits (ie. C:\NeverwinterNights\NWN\portraits) and put the portrait files there.
Voice Sets
http://nwvault.ign.com/View.php?view=Hakpaks.Detail&id=6701 (This .2da file should go in your override directory.)
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Think goblins look like muppets? Check out this link to an awesome goblin skin override, originally posted at EFU by Oroborous, that makes your goblins look wicked and vicious like they should. (Recommended for everyone, not just players of goblin PCs.)
http://nwvault.ign.com/View.php?view=Creatures.Detail&id=601
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Goblin names, history, deities (there is more than one), and other great information:
http://www.candlekeep.com/library/articles/goblins.htm#names
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EFU Goblin history:
https://efupw.com/efu1-forum/topic/26/26634/goblin-lore-and-little-known-quirks/index.html