I did find this little trick me self in a battle where the Pit was only the creature alive at the end. So, I killed it and found that it's gives exp.This is a good way to make exp if you are near to pass a level. When it is missing like 1000 or 10000 exp before a level and no creatures around ...
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Maybe it's because I hate drows more than I hate Humans - Jarlaxle to Entreri