Deep crimson ring that absorbs fire damage. Equip on a yeti and see what happens.
Berserker Ring is an accessory exclusive to Umaro, which enables Umaro to throw allies at enemies for increased damage while also curing that ally from some statuses such as Confusion and Sleep, in addition to providing +5 Strength, nullifying Lightning-elemental damage, and absorbing Fire-elemental damage. It can be found at the Cave on the Veldt or won from the Dragon's Neck Coliseum by betting the Blizzard Orb and winning.
Berserker Ring is an S Rank special accessory that provides Wall Rush BRV Damage +20% and Wall Rush HP Damage +20%. It can be obtained from the shop by trading in 2,000 gil, Sniper Soul, Hyperstar, and five Tome of Mysteries.
Berserker was originally a term for Norse warriors who fought with uncontrollable rage and reckless disregard for their own lives. The term itself is typically translated as "bear's skin" in reference to the animal skins Vikings would wear into battle. Theories about what causes berserkergang, the fury Berserkers go into, include possession by an animal spirit, drunken rage, and ritualistic dancing. Berserkers are often depicted in art as men with crazed eyes biting their shields in anticipation of battle.