The Arzinian Avatar of Magic is an avatar of the Arzinian Being of Bordanzan that may be fought in the Between a Rock... quest. It only appears if a player's highest combat stat is melee, if it is magic or ranged, the avatar of ranging or strength will appear instead, respectively.
It's strength is based on how much gold ore a player has in their inventory. If fought with 5 or less gold ore, it will be level 56 and possess the ability to infinitely regenerate. If fought with at least 6 ore, it will be level 53, and if fought with 15 or more, it will be level 50.
A level 56 version of the Avatar is fightable as a class E boss monster in the Dominion Tower minigame if the player has completed Between a Rock.... It is the only form of the avatar that may be fought in the Tower.