The Drowner Contract is a monster contract in Act I, picked up in the Outskirts of Vizima. The Church of the Eternal Fire wants the local drowner population thinned out, and its Reverend will pay for three drowner brains as proof of the work.
The catch is knowledge rather than swordplay: Geralt can only harvest brains once his Bestiary has a proper entry on drowners. Read the Swamp Monsters book, put a Bronze talent into Monster Lore, or bring food to the old townswoman in the village and let her chat. After that it is just a matter of wading in, swinging and collecting the slimy goods.
