Black mask

A black mask is a very helpful mask. Although it lacks solid defence bonuses, it gives a 15% Attack and Strength boost against all Slayer tasks. This can't be added to the effect of a Salve amulet against undead Slayer tasks. It also has ten charges that randomly lower the opponent's defence level by 3-10, whether or not the opponent is the task given. The defence-lowering ability can only be used 10 times, completely at random. Once the charges are gone, the mask and its attack and strength bonuses remain, although there is no way to recharge the mask. It requires 10 Defence and 20 Strength to wear.

It is dropped by Cave Horrors (Level 58 Slayer required) in the Mos Le'Harmless Caves.