Perfect Cage

Oso finally arrived just in front of the black dome as he finally got to understand what was that thing. He just couldn't believe that space distortion was could be used this way.

Oso reached his hand towards the black dome and sure enough, his hand just went through it. This dome was not some kind of barrier and there was no restriction for him to enter. Everything was normal except for the inside of that place to suddenly turned dark.

Oso then retracted his hand and made a step back. From what he was seeing, the reason why the sunlight couldn't penetrate that darkness was that it was being transported somewhere the moment it made contact in this dome of darkness. So other than the sunlight or any kinds of light, Oso guessed that everything else could have the leisure to enter and exit freely as they like. As such, this dome of darkness was only used for blocking one's sight. Other than that, Oso couldn't see any more purpose.