Blocks negative energy. It is a gemstone that continues to be loved as a powerful amulet since ancient times. Jet black glow swallowsall evil spirits and defeats them. It will prevent you from being attacked when you are weak. It is useful when you want to solidify your defense or when you want time for energyrecovery. You will be able to move when vou are in perfect condition.Improves both stamina for mind and body.