Hm so from I have understood, the two biggest forces are the Union, and the Magic Empire. You can see it as orthodox and unorthodox factions in Murim, here it’s light and dark (I’m still not sure there is only dark in the magic empire and vice versa but they’re the only ones I’ve encountered til now). They are also overseen by the extreme divine sphere (Constellations and Demons), which sometimes will junk stuff imbued with their power to the mortal world for entertainment (sacred or demonic relics), or assign « blessings ». For these light and dark factions, there are countless divided power properties, most of which are represented by a family/clan which has perfected and represent it. Often they can be different sides of the same coins, ex : poison clan/medecine sage family, and goes the same sometimes for power, ex taming through fear (dark) and through loyalty (light). As for who brought on the ruins it was the Blood killing demon or whatever blood demon. As for why don’t remember but anyway they had contracted a demon.
A lot actually... but can someone who reads the novel explain the background to me? Light faction? Dark faction? Demons? Like... who destroyed the world and why? That part is a bit confusing tbh...