To the first question, the purple flowers exude heat, keeping animals and humans warm despite the freezing cold of Arbroria. They've also been shown in some medicinal books there, which is the author foreshadowing that they almost certainly can cure the "Shade" infection in the desert.
We don't know what the "sun god" there is. It has appeared in different forms, so either it's something magical like these flowers or the summoning of Sunwon to this world, or it's someone piping fucking hallucinogens into the room - we've seen that room filled with purple/pink gas every single time we see the "sun god" and his followers in it, including the "sex" scenes. It's almost like everyone is fucking high when they're there, since they become irrational and weakened in a way.
Ppl I'm lost....
What are those purple flowers?
Why does mc sees his ex but Albis sees mc?
What the actual f* is the "sun god"?
How did mc even get summoned their in the first place? Cause there's no explanation...
Plus I'm not tripping but did mc got the cut instead of that other blond, yellow eye dude (forgot his name sorry) ??