In Assassin's Creed Valhalla Siege of Paris you can get abilities that grant you additional skills. This way, you won't have to rely only on the attacks you unlocked in the skill tree. On this page of our guide you will learn the locations of abilities in Evresin.
Plague of rats
The Plague of Rats skill can be found in Gisacum Ruins.
When you get inside, you will see a cluttered passage. Your task is to destroy both such walls. You can do this with the flammable jugs or with the special skill called the Incendiary Powder Trap.
The treasure is located behind the walls. This ability allows you to summon rats and send them at enemies.
You will gain the Goule Breath skill during the raid.
You will come across this book while exploring the church. Inside, you will also find cargos that you can loot.