Damien had no choice but to use his Mirage of Myriad Phantasms to quickly dodge the ethereal attacks while trying to think of a way to deal more damage without collapsing from exhaustion.
His Rain of Death was not as effective as before since this time, he didn't make dead ethereal beasts explode and release Anti-God Energy. It not only will make him vulnerable while trying to make the ethereal beasts explode, but he might be weakening his own people after they explode.
He knew this Xeton army wouldn't live long, especially after having been experimented upon with nethereal energy, which would surely destroy their ethereal core within a few days at most. But even just a day was enough to corner Damien and his people and put them in a very difficult spot.
He never stopped keeping an eye on how the others were doing, especially since most of the attacks were falling on their side.