Goblin

Goblins are nasty creatures, who have an insatiable goldlust and enjoy playing tricks on innocent people. These vile little monsters have great magical powers. They can posses humans, make people ill, and have telekenetic ablities. Luckily goblins also have a few weaknesses. One can trap them in something made out of lead, and they die if the human they are possesing is killed. One such goblin was accidently set free from it's lead box by Merlin, when the young sorcerer was fetching an old tome for Gaius. The little blighter first stole all the gold it could get its claws on. It then proceded to posses poor Gaius and in this form played horrible pranks on Camelots citizens. The goblin made King Uther bald, turned Arthur into a donkey-like creature, coused a wave of flatulence to erupt in the kingdom. The mischievous being was finally stopped when Gwen & Merlin tricked it into licking a gold coin laced with poison. The tiny demon fled its dying host and was trapped inside the lead box once more. Later the box was thrown deep in Camelot's vaults