Witch oil is a substance that is produced by bleeding energy through The Bleak Gate. After death the souls of the dead remain in the bleak gate for about a day before passing on. During this time it is possible for spirit mediums to communicate with the dead. Witch oil is a liquid embed with a highly concentrated dose of bleak gate energy. When a creature dies and it is near a source of witch oil its soul does not pass to the bleak gate but instead to the witch oil. The soul is then trapped within unable to escape. If the oil is then burned the soul is destroyed releasing a massive amount of arcane energy. Witch oil can be used as a substitute for any arcane ritual component.
The moral implications of using Witch oil is one of high contention in Ber, the main issue centering on the existence of an afterlife. Whilst the applications for witch are numerous producing even a small amount of it is dificault, and finding mages and scientists willing to work with it more so