After finishing off the enemies on the outside of the tomb, they went to proceed inside. Even though the air's moisture was humid, they still felt that the place was radiating hot air current. The place was damp and the walls were mouldy. Making Xin feel he didn't want to touch the walls. Also, Niko saw the great painting of them sealing the Demon Lord of affliction.
"Sun Xin, see that? We almost died back in time. We can't kill the Demon lord or it will possess us. But we have to seal him no matter what. The heroes were wounded after battling multitudes of enemies.
"Their potions have run out and we are surrounded. As a last-ditch effort, we sealed the demon lord. We succeeded in sealing him but the heroes turned to stones.