It could be considered stupid to send the most promising prodigies to another shelter just to conquer it because the high-risk possibility of them dying was always present!
As such, using efforts and funds to create Overlord beast tides might as well be the most efficient way to hit two birds with one stone; utilizing the most combat prowess without the risk of being injured or killed needlessly.
Maybe Shane's expectations were too high and he thought that fighting against the Shelter captain and several of his soldiers would be exciting.
Unfortunately, this was not the case and less than five minutes had passed before Shane had already killed his opponents before he confiscated their spatial rings.
Meanwhile, the darkness enshroudment around Umbra and the Shelter captain vanished, allowing Shane to see that the shelter captain was heavily injured, while Umbra was perfectly fine.