The scene in front of Ace was like some monochrome painting which was filled with narrow slits, and from within, colorful lights were emitting. It was like someone had torn through that strange barrier with a knife multiple times.
Furthermore, with Ace's sharp thief sense, he could feel faint traces of Qi leaking from those cracks, and something was trying to prevent that.
Nevertheless, it wasn't that important at this moment. Instead, Ace had pretty good assumptions about what had caused this.
'Could it be when I destroyed the Sun Secret Realm, the aftermath caused all this?' Ace thought grimly, 'I should've known this would've happened since the Sun Secret Realm was a part of the Sun Mountain, and heaven is involved above all. It seems this mysterious barrier is deeply connected with the secret realms.