Delta gallops through the forest nimbly with the mutated bugs behind her.
She picks up her pace, even more, when the Mutated Bug Wave finally started. There are not only a couple of hundreds of mutated bugs but there are thousands of them that look like a black tidal wave following them from behind.
Rex remembers that Duncan told him that this Mutated Bug Wave attacks everything alive.
Every time nearing midnight, the tall mutated trees inside the Purple Conifer Forest will emit an alluring scent that will wake every mutated bug and also makes them aggressive and hungry. It's not that they're actually hungry, but the scent makes them feel like they are hungry.
Because of this weird alluring scent, the Mutated Bug Wave appeared.