When the war started, it scared him. It was loud and violent and bright, and he wanted to hide as deep as he could. So he hid in the depths of the mine, then dug down further, using gauntlets pieced together of old armor shards to dig and press through gaps.
He got past the mine, and went deeper, through any spaces he could find that got him away. His dentae are numerous and very sharp, his jaws open unusually wide, and he can process most fuels, so he ate raw crystals and animals for fuel and kept delving.
He’s been deeper into the planet than anyone other than a few exploration teams, he’s seen wildlife that no one else has seen, and he understands how the planet works.
Cybertron is a living being, and it is, in fact, the being known as Primus. Whether or not one believes it’s a god varies, but it is undeniably a living creature. The entire planet is laced with wires and lines that gather energy, from sunlight exposure and solar radiation, and store it as energon. This is largely lost knowledge.
The planet nearly died for two reasons. First, and most dangerously, the warring population on its surface took more energon from it than it could stand to lose. It functions fine losing small amounts of energon to its inhabitants, just not losing EVERYTHING. Second, all the buildings on the surface were blocking out its absorbance of different energies from space.
Avalon slept near the energy lines, and the planet’s impulse-thoughts carried over. He understood the gist of this from his observations, and the details from the planet, and the planet guided him to safe passages ever deeper.
Until he decided, of his own accord, to surface again. The planet was weak, almost dying, barely kept alive by the energy it was getting from the sunlight.
Avalon doesn’t have a concept of gods or religion, but he understands that the planet is alive, and deserves more respect than it’s getting.So he surfaced, and he started looking for solar panels. Natural creatures or artificial constructions, anything he could find that got its energy from somewhere other than Cybertron itself. Every time he found something, he’d take it down to the nearest energy line and, one way or another, give the energy to the planet.
Essentially, making sacrifices.
Milu doesn’t know why Avalon is doing this. He has a tiny bit of an idea, but he doesn’t actually know that the planet is alive, his background as a weathervane for nobles didn’t give him much of an opportunity to learn that. It’s clearly important to Avalon, but Avalon has no way to explain himself.
He’s basically the first priest of an accidentally created religion. That involves feeding and petting one’s living home planet.