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Shady Joe is the one who gives you a time offer. Especially an offer about Potions and Orbs. In version 2.8, he's no longer around you, as he's replaced by his cousin Eve due to his vacation.
In version ___, He was re-introduced back to the game, with more then he had when he left. Now by doing rituals you will fill up a vile that can be found beside your totem. When you fill one up, Shady Joe will take it and give you a rewards chest. This chest will contain magic items that can be used to create usefull spells in the Magic Book.