```
The rules of the mecha challenge are similar to those of the Endless Deathmatch Arena.
It also involves consecutive victories, thereby stacking wins to increase the amplitude of mecha soul enhancement.
During the process, in addition to Purgatory monsters, you'll also encounter other mecha squads of similar strength, which will engage in battle.
The victors advance, while the losers exit the stage.
Mecha squads are much more challenging to handle than the monsters of Purgatory.
After all, mechas can be equipped with modules sourced from various disasters and gain the enhancements of a mecha pilot's unique traits.
Not only are their methods varied, but they also possess various bonds, combinations, and configurations.
With similar base attributes, their combat power far exceeds that of Purgatory monsters.
Moreover, although Zero, Yun, and Yuu are 3rd Rank mechas.