Udalin is an explorer in the original Neoquest. He ventured into the Temple of Roo after it had been cursed, and managed to make it down to the bottom level where the Archmagus of Roo waited. He discovered the secret keys that unlocked the path to the Archmagus. Having explored all he could, Udalin left a note to anyone who happened to come after him.
Udalin's fate after writing the note is unknown.