Knowing the next threat for him was related to Chaos energy hinted by the System itself, Rex needs to get to the bottom of this, without missing any details. Dargena City—the core of his Clarentium Empire is extremely durable and strong thanks to the castle.
It would need multiple ninth-rank realm entities to break through the outer barrier.
Now, the barrier could probably block a peak tenth-rank realm attack fine.
Even before reaching the barrier, the Circling Sentinel, hovering above the cityscape was the first obstacle that needed to be confronted. It is extremely fast-moving, and could anticipate any projectile attacks.
But now, those defensive measures were rendered useless.
Since Chaos energy, spreads through corruption—not a literal attack, it could pass through both defensive measures without a hitch. Rex took what he encountered at the Colosseum lightly, and now his city was attacked by a chaos spawn.