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Adamantine Ore is one of the two top-tier ores in the game and can be generated by destroying the third altar each round in Hardmode. In the world where it is generated, it is the rarest and most valuable of the three altar-generated ores.
To mine adamantine, you need a mithril drill/orichalcum drill bit, a mithril pickaxe/orichalcum pickaxe, or better. To craft an Adamantite Bar, you need an Adamantine Forge made from 30 Adamantite Ore and a Hell's Forge.
Adamantine Ore, as well as Adamantine Bars, can also be obtained by opening treasure chests, thus eliminating the need for high-level pickaxes.
Adamantine Ore is also dropped from Ocram.