The Witcher Bestiary - Dagon
Dagon Occurrence: Dagon is a mythical creature; according to the legend, it rests at the bottom of a lake near the village of Murky Waters.

Immunity: Dagon is a deity, so he cannot be killed.

Susceptibility: The creature receives energy from its believers' faith, which might be his only weakness.

Tactics: When Dagon ventures out on land, destruction follows him.

Alchemy: Dagon Sap.

That is not dead which can eternal lie, and with strange aeons even death may die.

Powers older than humanity slumber in the depths, where no sunrays disturb them. Gods and demons sleep in underwater cities awaiting their time, and it is said that when the hour comes, they will awaken and bring annihilation to the world. One of those creatures, Dagon, rests at the bottom of the lake and is worshipped by vodyanoi and lunatics. Dagon is an embodiment of strength and fury, and when he comes ashore, he becomes destruction incarnate. Forbidden books like the Hymns of Madness and Despair describe the ways to summon him, for he can only be called to a place dedicated to him.