Here's my analysis of Elden Ring's star level stuff and why I think it's legit FWIW
I figured it would be good to just have this info all in one place. The long and short of it is, the scaling of the setting heavily rests upon the shoulders of General Radahn, and there's a lot of debate across the internet as to whether it's valid, if the stars are meteors, and so on. This is...
onelastforum.com
I did make some errors which I note in this thread, Radahn does not turn day to night in his phase change, that's just the Dark Moon pulling up to
make sure he's dead because it hates him that much for messing with the stars and stopping its envoy Ranni's fate.
https://onelastforum.com/threads/elden-ring-star-level-scaling-explanation.4898/#post-410019 <-highlighting the corrections here
in the DLC, Count Ymir also talks about what are essentially supernovas seeding life
[1200500000] I am a glintstone sorcerer.
[1200500010] We study the stars, and examine the life therein.
[1200500020] Are you familiar with our findings?
[1200500030] Long ago, we began as stardust, born of a great rupture far across the skies.
[1200500040] We, too, are children of the Greater Will.
[1200500050] Is that not divine? Is that not sublime?
[1200500060] ...and yet, none can fathom its implications, its utter brilliance!
so I think this reinforces that Elden Ring's sun is a legitimate sun and the actual stars, are real stars. Likewise the Mother of Fingers was said to have been sent by the Greater Will on a
shooting star, which knowing this is also how the Elden Beast arrives should clarify that the EB also arrived on not a real star. We also have one of Miquella's spirits noting this
"Lord Miquella, forgive me. The sun has not been swallowed. Our prayers were lacking. Your comrade remains soulless... I will never set my eyes upon it now... Your divine Haligtree..."
It was a lot more blatant in version 1 of the game where they said "Our sun is held in thrall" but the only real reason we are ever given for any sun to stop moving is Radahn's meddling, and Miquella had to discard his body and fate, which Radahn also stopped, to enact his plan. It doesn't seem a stretch to conclude the sun was among what Radahn had interfered with.
Anyhow, he's stronger with Miquella as the latter became a true god, and Radahn utilizes his light to fight with. How much stronger isn't clear, as the only other god still alive is Marika, who had the entirety of the Elden Ring in her so I don't know that we can say Miquella is truly her equal, although he does oddly mirror Ranni's goals when you beat the game. 1000 year voyage and all.
Elephant in the room I think it is probably safe to say he's stronger than Malenia now, as he's considered a true Lord and him and Miquella give us the "God Slain" upon defeat which Malenia doesn't, which supports the theory that she had only bloomed twice and the other Aeonia flower in the Haligtree was one of her daughters.