Demon invasion

Generally opening the portal to other worlds was rare but it was not rare and with a little effort and time, one could open the portal to other worlds.

However, those portals could only allow no more than a dozen beings to pass through them to the other worlds.

So, the demons used one of the royal demons who possessed a skill that could enhance the portal to the larger version that could transport a huge demon army to a special world when he was killed by the being from that particular world.

'Kill humans...Invade the human world,'

'Kill humans...Invade the human world,'

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Just as Ajax and Edmond left from there, many demon servants started coming out from the pitch-black portal while muttering their slogan. They moved in a particular order and they all looked in a particular synchronization.