Dagon Sap

"The mages of old created the formula for this mutagenic potion which should, in theory, greatly strengthen a witcher physically. Their notes indicate that the secretions of the mythical being named Dagon are required to produce the potion."

When imbibed, Dagon Sap, a mutagenic potion, provides access to a special Strength attribute enhancement; the upgrade increases damage inflicted on opponents when the witcher is wounded.