Skull of the Corrupted Shaman at his sigil in a throne room arena. This is found in The Forgotten Ruins at a range of 350 tiles from The Core. Malugaz is an extremely tough boss who will probably still be a challenge while using equipment from the outer biomes. https://como-fazer-wing-5-mu-onli17464.glifeblog.com/29203738/core-keeper-gameplay-secrets