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://final-fantasy-vii-rebirth91228.blogdigy.com/detalhes-ficção-e-core-keeper-gameplay-44582077