Long Yi had conducted experiments on this new self-destructive attack method of beetles. The self-destructive beetles launched from the bug hive didn't possess any intelligence but had certain instincts. They could fly, identify targets in complex environments, and avoid obstacles up to a certain extent before directly attacking the target - after all, they were beetles.
Then, with the immense speed during the launch, coupled with their gliding ability in high altitudes, and their wings accelerating at the end, these beetles, which were akin to large missiles, could eventually reach a range of nearly twenty kilometers!
Honestly speaking, compared to the world from which Long Yi came, where even rocket artillery had a range of as much as three hundred kilometers, this distance wasn't much. But if you compare it with the White Dragon's breath attack, which only had a measly range of less than a kilometer, then you can understand what twenty kilometers meant.