at Furnace It can be crafted at Furnace.
Obsidian Skull sits in the Pre-Hardmode tier of Terraria progression based on its rarity rating (2).
Menacing is the strongest prefix for Obsidian Skull — +4% damage — best offensive accessory prefix.
Obsidian Skull is used as an ingredient in 6 recipes. See the "Used to craft" section above for the full list.