It is a Mod weapon only. That means only the staff can use it.
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iron island
TM 23 - Iron Tail can be found on Iron Island.
You can find iron ingots in chests next to monster spawners. But because monster spawners are rare then it would be a lot easier just to mine until you find some iron the melt it in a furnace! :)
You can find it on Iron Island.
Under ground. In caverns. Its not that hard to find Hope this helped