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The Dark mage is found in Draynor village and in Edgeville and converts the Normal spellbook to the Ancient spellbook or vice versa for free. The quickest way to reach him would be using a charged Amulet of glory teleport to the village or setting your home teleport to Draynor village by talking to the Fish monger in Barbarian village (you will need an active email address set to your account to do so). Players can also use the ancient teleport Paddewa teleport to switch their spells at Edgeville.