Blade of Reflecting Failure

A dark green double-edged greatsword made from adamantine. The blade thins close to the hilt. The crossguard is comprised of two pairs of black metal spikes facing towards the blade, one small pair close to the thinner section of the blade and one greater one that functions mainly as the crossguard. The grip is colored an even darker green, almost black, and lacks any decoration. The pummel looks like a claw gripping an adamantine cube. While having the blade equipped, you may add half your proficiency modifier, rounded up, to any die you reroll. Attacks made using this weapon are considered magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage.