When Arthur said that 5 hostages were a perfect number, he genuinely thought it'd be enough.
But a few minutes later, as he sat on the ground, staring at the groaning Infernal Devil Lords sprawled nearby, he rubbed his chin and muttered, "I'm not sure how much the death of these 5 is gonna affect the planetary barrier."
At this, Lostvayne, having assumed her female humanoid form, crouched beside him and asked, [Do you plan to destabilise the barrier?]
"Oh, no. Perish the thought. I just wanna threaten them with destabilisation and the potential destruction of the barrier. That's why I need hostages."
Arthur had easily rounded up the 5 Infernal Devil Lords, the entire battle lasting only five minutes due not only to the disparity in Existence Realm Stages, but also to Arthur's raw power reserves, which exceeded all 5 combined.
