Arthur took deep breaths to stabilize himself, whilst pulling in ambient cosmic energy into the forearm guard on his left arm—the Rule Breaker, 'Stellar Guard'.
The boy activated the Cosmic Treasure and covered himself with an imperceptible barrier of cosmic energy.
Now then, one would probably wonder why Arthur was activating the Stellar Guard 'AFTER' and not 'BEFORE' the supermassive explosion that killed hundreds of Sovereigns with its power.
He did this because he knew that the real danger to him, was coming 'AFTER' the formation had exploded.
Taking a deep breath, Arthur sharpened his perception, spreading out spatial law energy so he could sense even the slightest rustling of the wind.
But even with all of that, even with his ridiculous thought and perception speed which had been enhanced by the 'Third Magic' and boosted even further with his Time Magic, he was just barely able to sense it.
