The wolves are moderately powerful -they have 180 hit points, compared to regular wolves with 45 - and will easily kill villagers and damage buildings. However they can be easily defended against by combat units. As such, Fimbulwinter is best used while besieging an enemy town to distract the enemy and prevent them from using their own god powers, as no other god powers can be invoked while Fimbulwinter is in effect.