:shame: common mistake. First, there are slayer tasks that cant be done using guthan. Second and most important, if you want to practice slayer effectively always bring some food with you (and pots ofcourse). The main reason is that guthaning slows you down. Once you put on your guthan you have to take off your mask ,which means you loose the awesome mask effect +other attack bonuses(from unequipping your weapon) . I always take food when on tasks,and use my guthan every now and then. So yes, guthan is very handy for slayer but i wouldnt recommend relying solely on it.