Update: By request I added a version that just crafts the vanilla serum. THIS CAN CRASH YOUR GAME WHEN CRAFTING, USE AT YOUR OWN RISK!
v2: Fixed an error with the mod and added a Chemist version that increases the duration of the effect if you have the Chemist perk.
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This mod adds a recipe for the Mysterious Serum at the Chemistry station under Drugs. You must be wearing Lorenzo's Crown to see the recipe ( you also need at least Chemist rank 1) so I made the crown lootable from Lorenzo's corpse.
This is mainly intended for anyone that chose not to side with Lorenzo to have a option of still getting the Mysterious Serum, but you might also be able to pickpocket it from him with the right perk.
*The serum crafted is not the same as what you get in the quest since making that craftable crashes the game, so I created a new version that has the same benefits*
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Optional file provided for anyone that has a mod that already changes Lorenzo's Crown.
My mods: Link