It's just a signature Druid power.
Imagine these gnolls guarding the entrance to the temple of Yeenoghu. A thick mist starts to form near them, quickly expanding until it swallows them. Suddenly you hear metal slashing throw flesh and leather. Next thing the mist vanishes and you see a group of warriors where the gnolls were, their weapons dripping blood, and a Druid coming out of the woods.
Anyway, i like it, it's cool. Maybe it's not that powerful, but it's not much worse than the other 2nd level utilities.