Abyss.
The first layer of Blood Battle Battlefield.
This is the place most worthy of the name "Blood Battle."
The bloody atmosphere is no longer just pervasive; it has become a thick, tangible substance, weighing heavily on every inch of space.
This "Invasion Zone," solidified by Star Realm rules, is the deepest, longest-standing wedge driven into the heart of the Abyss by the Alliance Army of countless worlds, enduring the most frenzied and relentless counterattacks from the Abyss.
Because everything stems from this place.
According to the rules, if this place is engulfed by the Abyss's counterattack and reabsorbed into the Abyss, the entire rule of the Blood Battle Battlefield will be significantly weakened.
Other Blood Battle Battlefields might still exist, but the disappearance of this fundamental invasion will cause them to fall into disadvantage.
So, this place is extremely important.
