From the Super Mario Wiki
Octovaders are strange purple octopus-like creatures found at Land's End in the game Super Mario RPG: Legend of the Seven Stars. Using two of its tentacles, an Octovader holds two poles. These poles are connected to Koopa shells with bat wings attached to each side. Octovaders are extremely adept at magic, knowing many powerful spells.
Octovaders are relatives of Octolots, which are earlier enemies encountered in the Forest Maze.
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