Of Sweat and Blood

Of Sweat and Blood is a book in . When first read, it adds bestiary entries for nightwraiths, noonwraiths, and plague maidens, as well as formula for nightwraith decoction and formula for noonwraith decoction.
One can be received as a reward from Tomira, if Geralt decides to give her a swallow potion for Lena during the secondary quest On Death's Bed. It can also be bought from the following merchants:
* Marcus T.K. Hodgson in his shop on Hierarch Square
* Books merchant in Hierarch Square
It should also be available as random loot, but due to a randomization bug never appears as such.
== Journal entry ==
: A Veil hangs between the world men see and the one they cannot. This Veil blocks the dead from the view of the living, and the living from the view of the dead. Some mages can break through this Veil and communicate with the dead, or else summon them to the World of the Sun for short periods of time. This is the art known as necromancy.
: The dead can also break through the Veil and enter the world of the living on their own. Yet unlike the necromancers, in doing so they are not driven by reason and will, but by a thoughtless, irrational need. This need arises from powerful emotions such as regret, longing or wrath. Very often these emotions gain their power by being invested in a material object by the dead individual while he or she still knew life. The objects most frequently so endowed? Wedding rings, favorite toys - or the instrument used for the crime which sent the returned individual to the other world in the first place.
== Associated quest ==
* On Death's Bed
pl:Z potu i krwi
ru:Пот и кровь
Category:The Witcher 3 books