Krios knew that his opponent was not yet down, as he still felt Tenraz's presence among the rubble. So he followed up his attack with a barrage of fireballs the exploded in quick succession.
He can't use his Chaos Phoenix as it will most definitely damage the hall and can jeopardize the structural integrity of the underground building.
'I can't orverdo it as it might take the whole building down.' He thought.
He paused for a bit, letting the dust settle down. When the room finally cleared, he saw an injured Tenraz, standing in the middle of all the rubble.
He was bleeding from a lot of superficial injuries, but the Malevolent Energy covering his entire body protected him from any fatal injuries.
He looked at Krios with so much killing intent that Krios actually felt a chill run up his spine. But Krios did not mind this as he prepared to attack.