Evresin Abilities Locations
There are two abilities that can be found in Evresin, Plague of Rats and Goule Breath.
Plague of Rats - Gisacum Ruins
The Book of Knowledge which provides this special ability can be acquired during the Hidden quest.
The Gisacum Ruins are slightly different than the other two ruins, since you’ll need to avoid or kill some Frankish soldiers to get inside. As you approach the ruins, use your raven to scout them and look for the breakable wooden barrier on the ground. You can destroy this and then jump down the hole to another door which can only be opened with your Hidden Blade. You should be able to avoid the nearby Frankish soldiers relatively easily, but there aren’t too many to be concerned about if you’d rather kill them.
Once you’ve interacted with the bureau door, go inside and take a fire pot from the western wall. You can use this to destroy the breakable barricade at the northern wall. Through here you’ll find another breakable barricade which can be destroyed with a fire pot or the Incendiary Powder Trap special ability. You’ll find the Book of Knowledge in the rubble beyond this wall.
Goule Breath - Pont-de-l’Arche Monastery
This Book of Knowledge can be found in the main church at the Pont-de-l’Arche monastery, which is located in the northeastern part of Evresin. You’ll need to force open the door to the church to get inside, which can be done with the help of an ally as you raid the monastery. The book is located at the eastern side of the church.