This skill is used when brewing a Mutagens potion with a Mutagens brewing skill (Basic, Novice, Greater, Adaptive). This skill allows adding increased offensive capabilities to your mutagens potion. The increase is 1d4+Medicine Trait to Offensive and Bow Power while reducing Runic Power by the same amount, for the same duration as the Mutagens potion. A natural 20 allows for adding only the Offensive and Bow Powers bonus without the Runic Power penalty. A natural 1 causes only the Runic Power penalty to be applied.