The First Abyss was too large. Even if all the human knights in the Lion Fortress entered the First Abyss and spread at the same height on average, they would not see each other within hundreds of square miles.
If not the illuminating battle qis in battles and the battle qi lusters in flight, they could only have a visibility of a few miles in the First Abyss.
The First Abyss was a huge, deep well. If not entering the hotspot regions in the First Abyss on purpose, they would have a very low possibility to encounter human knights or demon knights in the First Abyss.
The hotspot regions in the First Abyss were closely related to the interests of both humans and demons, for instance, the Tiewei Mountain Range which was abundant in earth-elements crystals.
The fiercest battle in the First Abyss happened in Tiewei Mountain Range.
