This Ancient Ruins doesn't have some Array that restricts High Tier Cultivators from entering like in the novels he had read.
Instead, the high-level figures of these forces and clans are afraid of death yet unwilling to give up benefits, so they send juniors below the Fourth Realm from their clans to go in and help them fight over the things they want.
One must know, to raise a Sixth Realm Powerhouse, even if their talent is exceptional, it still takes at least one or two hundred years, consuming an enormous amount of resources. Therefore, their fall is a tremendous blow to any force.
So, compared to a Sixth Realm Powerhouse, Cultivators below the Fourth Realm, even if they fall in the Ancient Ruins, are still within what they can accept, and can be raised again.
