After witnessing what the Kakodaimons had to go through to pass, the smarter Daimons couldn't help getting scared, there was no one to guide them through what they would do, no mummy to show them care or daddy to pamper them.
Rather than making them go through natural selection, they were picked out by the Nedu, they allowed no resistance and instead shot dead the stubborn ones, after seeing the brutal method used on them the less smarter caught on and decided to behave. Maybe they could be taken back to mummy if they behaved well enough.
This was a whole new world, a whole new place, a terror cage that belongs to Erebus himself.
In the tallest building of the Island, on the highest floor...
"Son, this world I created for you, I have brought companions, the ones who would accompany you to the death, as long as they seem you fit, there is no escape nor is there an end to what you can achieve with what I have provided you. You just have to watch and have fun. The one who comes out on top, shrouded in darkness, the Zeus, shall you control".