Prepare yourself for the fourth and final high-level Slayer monster as part of November's Raptor's Challenge: Acheron mammoths! Head to Gielinor's frozen north with your best gear to take on the Acheron mammoths! Be sure to check them out this week to make the most of the remaining double Slayer XP! Will you be brave enough to take them on? Read on for further details, or play now! Where to Find Acheron Mammoths Use the new boat, north-east of Rellekka, by the rock crabs. You must be a RuneScape member. 96 Slayer is required to harm Acheron mammoths. Beware of their charge, and fight with honour!