Eye of Cthulhu Terraria: Infernum Mode Iron heart

How do I get the Lifeforce Potion in PreHardmode? You can find this potion in Dredons labs so I figured I could use it. Music The Binding of Isaac Antibirth OST Vol.
1 2 3 2016 Mods: Calamity Mod v2.0.2.3 Calamity Mod Music v2.0.2.2 Calamity Mod Infernum Mode v1.9.13 Infernum Mode music v1.9.8 Subworld Library v2.1 Bring Back Calamity Iron Heart v0.0.5 Nycros Nohit Efficiency Mod v2.2.1 Fargos Mutant Mod v2.8.8 Boss Checklist v1.4.0 Recipe Browser v0.9.8 Census Town NPC Checklist v0.4.3 Quality of Life v0.2.2 by me :D

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