Virgil's Cure

Virgil's Cure is a miscellaneous quest in Fallout 4.

Walkthrough
4. If you give serum to Virgil then new objective "Check on Virgil" will come to Miscellaneous quest section. Wait three days and go back and see that Virgil is now a normal human. After this, all the items inside the cave become available for looting.
 * 1) The quest silently starts when talking to Brian Virgil in main story quest "The Glowing Sea". Virgil requests serum in return to his favor.
 * 2) Find the serum in the FEV lab of the Institute. Immediately after taking serum into inventory new objective "Bring the Serum to Virgil" will come to Miscellaneous quest section.
 * 3) Bring it back to Virgil. The player character has two options:
 * You can simply give Virgil the serum, and certain companions will react differently to this choice. For example, John Hancock, Piper, Nick Valentine, Codsworth and Curie like the player's choice to cure Virgil, but Danse won't like it at all; this is due to his teachings by the Brotherhood. Strong also won't like it as he prefers being a Super Mutant and is angry with the doctor's ambitions to cure the others.
 * You can also lie to Virgil through sequence of three speech check, claiming that serum wasn't there. Checks difficulty increases with each one. After first two checks player character still have the option to give serum to Virgil through breaking and reinitiating dialog with him. After third speech check Virgil requests the player character to kill him and "Virgil's Cure" will fail.

Bugs

 * Virgil may become hostile while wearing a X-01 power armor suit.