By pursuing the moons together, the two have achieved greater attack power than even Fenrir. Rather than devouring the moon and sun, Hati and Skoll now revel in combining forces to devour their enemies. Together they rampage on through the darkness.
Skoll and Hati are two giant wolves from Norse mythology said to chase the sun and moon. The cycles of day and night and summer/winter soltices correspond to the wolves' pursuit of the celestial bodies. They devour the moon and sun at ragnorok.