A necklace that allows for a character to achieve a berserk state without being a barbarian. In this state you get an advantage roll on all strength, dexterity and strength saving rolls. During this state you also take 50% less damage, however every attack against you has advantage. When your health drops below a certain point while in berserk state you go into a state of desperation and gain a +2 to your original initiative roll as well as the ability to attack again, stacks with fighters buff. When in a state of desperation you can only attack and you gain disadvantage in saving throws of any kind. After the impersonated berserk state has worn off the character will be extremely tired and will roll disadvantaged on EVERYTHING, until a short rest.
Wondrous Item, rare