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From Aqpedia

Artix Krieger is the character of the game's creator, Adam Bohn. As such, he has all the best (and otherwise unavailable) items, and has all his stats and levels are as high up as they can currently be. However, there is a second Artix Krieger: he is the first NPC you see in town, standing next to Twilly. He can also be a guest in battle under certain circumstances. He can automatically heal the player fully in town, and can sometimes restore 5% of their health in battle. He is often the one who gives the player several of their quests.