A Priest of the Eternal Fire asks Geralt to cremate three piles of dead bodies for him. This will count among Geralt’s “good merits” the Priest tells him.
A dramatic scene between Geralt and Regis, with the latter going into a torture cage in order to harvest some of his blood.
For this guide I’m going to concentrate on the monsters you find in the wilds – the “generic” monsters that can be encountered while out in the world. Not the Monster Contracts – that’s a separate guide.
The quest Forefather’s Eve in The Witcher 3 leads to a dead body. Rotfiends are already nibbling on it.