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://persona350504.blogkoo.com/o-melhor-single-estratégia-a-utilizar-para-core-keeper-gameplay-49485490