After reaching the "Astanina Ruins" Rein started to check the whole place with his Eye of Truth. Very soon he was able to notice that this place was more mysterious than they had expected. Actually the whole ruin was just the tip of the iceberg and there was a larger ruin under this place. Those two transcendental powerhouses unfortunately had come across one such ancient trap that was too much for them someone of their power level.
The main hidden ruins were created before the great calamity struck and it was extremely dangerous. As for the outer ruins that was the danger zone, it was something that was created after calamity by someone probably with the intention of hiding the true ruins and this plan was truly quite successful. Before Rein and his overpowered eyes, no one had managed to notice the existence of this true ruin.
