Twilight Alchemy II

 uses the Spirits from the Alchemist Spirit skill to help you create Slim White Potions extremely fast. When you begin casting, you will attempt to create 200 Slim White Potions, one every 0.005 seconds. In order to cast, you require to have all the items you would need to create 200 Slim White Potions normally, and the success rate is no different than if you made them one at a time. When used, your alchemist ranking will raise based on your success rate as if each potion were created separately.

On iRO, this skill is localized as Spiritual Potion Creation (variant 2).