The Heart of the Wilds is a book in The Witcher 3: Wild Hunt that, when read, provides bestiary entries for leshens and sylvans, as well as formula for leshen decoction and formula for ancient leshen decoction.
It should be available as random loot, but due to a randomization bug never appears during gameplay, and can only be obtained through console commands.
Journal entry[]
- Leshens dwell in dense, primeval woods. Fiercely territorial creatures, they hunt with stealth and cunning as their only companions. They use their inborn magic to control the plants and animals within in their territory — and so when stalking them, half the battle is merely getting near enough to strike. Leshens old enough to earn the appellation "ancient" wield advanced skills and tactics that make them particularly dangerous.
- Some leshens create magic totems that increase their strength — in such cases those totems should be destroyed before or while fighting them. Furthermore, some leshens can create for themselves a kind of immortality in the following way: the leshen wounds a lost traveler passing through its woods with its claws and casts a black magic curse on him. For as long as the individual marked in this way stays near its territory, the leshen will be reborn every time it dies. Such leshens can only be defeated by driving away or killing the person they have marked.
- In combat leshens use not only their long claws but also their many allies: wolves, who unfailingly answer their call, or ravens, which harass and distract the leshen's opponent. Leshens are also able to bend plant life to their will and make it aid them in battle. It is a witcher's good fortune that leshens do have one weakness - they are extremely vulnerable to the Igni Sign.