This isn't the last we've seen of eternity

I know it has become annoying that many people are going "will this character be in Doomsday/Secret Wars" but hear me out. Ever since Eternity appeared in Thor Love and Thunder I knew we would see him again in the future. And then it dawned on me. Eternity is the personification of the Universe itself. Secret Wars will be all about the multiverse. Does that mean each universe is a different eternity? If so, what happens to the eternities when all universes inevitably merge into battleworld? What are incursions like from the perspective of Eternity?