User blog comment:Crimson and Darkness/Shin DxD 4 discussion/@comment-39047410-20200219231529

The UL contacted their god-creators that they killed Great Red because he's the creature that control space between dimensions of DxD's planet.

Great Red wasn't even an opponent for Regalzeva.

Regalzeva after killing GR: "Infinite creature? Is whose power equal to infinity? Or existence itself? Besides is this creature similar to "FxF"?"

UL plans on creating anti-weapon after collecting data about all Divine beings from each Myth and Supernatural life forms.

The UL are interested in Dragons as they display images with Ophis, Crom Cruach, Draig and Albion in which Melvazoa says to get samples for his army. Their interest in Dragons is because ExE doesn't have them, they are DxDU's most powerful creatures, and that they are similar to creatures in FxF, though Dragons appear to be stronger and smarter than the beings in FxF.

Regalzeva's group is the first group, the next one will invade in 30 years.

In the "Omen of the End" Ise and Riss were chatting on top of the house. But suddenly Ise sees scared Ophis and Lilith that look at the sky and tell: "Great Red is...."