Effects: This potion significantly increases maximum Endurance; it is predominantly used by witchers trained in the use of Signs.

Preparation: The potion is made by mixing ingredients providing two measures of rebis and one measure each of aether and quebrith; strong, high quality alcohol must be used as a base.

Duration: Long

Toxicity: Medium

According to an old tale, this potion was first made by dryads from the forest of Brokilon. The formula was obtained by the druids of Maribor Forest, who then passed it on to their brethren in other corners of the world. The formula also reached Kaer Morhen, where the practical-minded witchers began producing the potion using ingredients obtained from monster carcasses.