Recently I watched a video walkthough of Firestorm Citadel. I noticed that at some points in the walkthough there were regenerating freeze vials, probably there to make the player's life easier. I thought that if Firestorm Citadel could have regenerating freeze vials, why not add regenerating poison vials to the jelly king fight?

Adding regenerating poison vials to the Jelly King is a good idea because:

1) Completion of Battle Royale would be less dependent on how many poison vials were dropped before you entered the stage.
2) It would give players who run out of poison vials in the middle of the fight a chance to win.

Granted, I think you can buy poison vials at Moorcroft manner, but you're unlikely to do that if you are running in a pick up group.