Healing potions

The  were preparations created using magic and alchemy that healed most injuries.

They contained a portion of life force that promoted healing.

Guardian Thane was skilled in the preparation of the healing potions, able to perform both the alchemical work, and the life-force-infusing component of creating the potions. However, the life force had to come from a living being; only a limited supply could be drawn from humans without injuring or killing them. On the other hand, the trolls had enormous regenerative ability and could supply much more frequent drawings of life-force.

Brianna Barter learned to perform the alchemical portions (preparing the base potion) of the job from Thane, and was even able to automate it using animated skeletons in Thane's lab.