Furor Venenum is an advantage to Bite. It costs two advantage points.
Effect[]
Bite now has a 2% chance to Stun the target. The stun is guaranteed if the target affected by Bleed or Deadly Poison. If the attack successfully stuns the target with those effects, it applies Furious to you. Biting the target again will refresh and existing stacks. And stunning a bleeding or poisoned target will apply an additional stack (maximum of 3).