Sylvan elves

Be more gentle, XEL, be more gentle. If you remember, there was nothing at all at first, and the Elements created the world. There are many gods – Scandinavian, Egyptian, Chinese, and others – who, according to legend, created the world. And the same Elemental Lords can restore the world. Or the Guardian himself, using the technology of the Ancients.

The Elemental Lords did not create the world. That legend spoke of the "creation" of Cron, which, as is known, is a planetoid created by the Ancients. In fact, that legend allegorically tells about the struggle of the Elemental Lords for dominance over Cron after its creation. What the Elemental Lords created was the first Dragons. And the technology of Elemental Manipulation, which surpassed any magic, was possessed by the Ancients and their enemies – the Progenitors. And in the world of M&M, there are no gods in the literal sense of the word. NWC themselves have said this many times. There are no Heavens, Hell, or the Afterlife in M&M, there never were, and there never will be. Of these "otherworldly realms," there are only the Elemental Spheres, but it is clear that these are dimensions formed from distortions of space that arose as a result of the cataclysms of the Elemental War between the Ancients and the Progenitors. And it manifests in worlds where magic is more developed than all other technologies, etc. (Enroth, Cron, etc.). And the Elements in M&M are, first of all, not fire, water, air, and earth, but 109 (by that time, maybe more) chemical elements from the Periodic Table. Mugais, further on, it shows the spread of the explosion, and if it didn't cover the entire planet in a second, or if the movie didn't show how far it spread (although it was said), that doesn't mean it won't cover the entire planet. And there is no need to exploit the word "cosmos" as if it were another dimension! In general, just change the concept of Ascension itself, and it will be fine.

Added 1 minute ago
The Guardian using the technology of the Ancients is possible, but the Elements – no, I'm afraid not. The Guardian could have survived the Reckoning, but we need to think about how he avoided some kind of brain malfunction from such an explosion.