User blog comment:B214/Question and Answers 6/@comment-185.112.105.215-20161218170008/@comment-10330822-20161228002607

@Sky, its my understanding that they are tech-based lifeforms that are rocking near God-class level powers. I don't know why they were called Underworld Lifeforms either, I didn't really see any reason in the story itself.

So, Ise destroying armies of them is supposed to be a very big deal. It also explains why an actual war is even happening, because the Three Factions and allying factions should easily deal with anything below God-class, even with some many of the Top 10 missing.

The thing is though Ise is destroying them, so badly they are working with Loki to try and send Loki back to the past to kill Ise before he becomes so OP.

This is where EX comes in. Loki apparently cursed Asia before going back, possible to make Ise too upset to seal with the UxL army, but it seems to have had the opposite effect and just made him more angry. In fact, my guess is Ise may have Fafnir on their asses and gone Outrage on the army, and it seems he defeated them even faster than usual, because the leaders were shocked he got there "so quickly". In other words, they thought the army would last longer than it actually did.

He then comes back to the past himself and rendezvous with the team, and stomps on Loki.

That is basically what EX was. "Ise is stupid OP and has tons of babies".

Personally I feel the UxL may be the secret to Ise achieving his ExE power that Azazel hints that he might be capable of getting. It's kind of foreshadowed since Ise is forming and joining an "ExE" team after this tournament.