Osmium is arguably the best pre-hardmode ore, due to the strength of the weapons and armor.  One osmium bar is crafted from 4 osmium, and it can be used to make an Osmium sword, Osmium pickaxe and the Osmium Armor set.

The Osmium is proven to be the best pre-hardmode armor in the mod against Wall of Flesh. It is useful until you encounter the mechanical bosses.

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