Ok, the Salve Ammy E give 20% bonus to attack and strength. (when fighting undead) The black mask gives 15% bonus to attack and strength. (during slayer tasks) Are these bonuses to your level? (take level, add 20% or 15% to it (lvl 100 str, 20% of 100 is 20, so an invisible lvl 120 str) Do they stack (Zombie SLayer task, use salve ammy and black mask to get 35% bonus?)