User blog comment:Nearthel/Bellomarus, the Destroyer of Worlds (Background for my next custom champion)/@comment-1330314-20160422114451

Issues I take with the above bio:
 * Why would Aurelion Sol not care about crafting a star with anomalous energy? He's a being who puts immense amounts of love, care and attention into the stars he makes, so he would very much be concerned about the energy used to create Bellomarus. Moreover, he's ancient enough to know pretty much all there is to know about the cosmic forces in the universe, on par with, so he would know what the "weird energy" would be.
 * Conversely, why would Aurelion care about Bellomarus destroying worlds? He doesn't really care about planetary lifeforms, at least not as much as his stars, so the two should normally be getting along fine.
 * What exactly is Bellomarus? Right now, he's just "weird energy" from the universe that happened to turn into a world-destroying beast: what was this energy in the first place? Why does it want to destroy worlds? How does this energy relate to the Void, which is the current main player in world-ending doom?

Right now, you have a good lore premise for an apocalyptic cosmic force, but you need to flesh Bellomarus out a little more if you want that lore to click. It's great that he's kind of the Joker to Aurelion Sol's Batman, but you're going to have to make him fit in the entire League universe, and not just in relation to a single character. There's definitely a thematic niche waiting to be filled, one you're touching upon, but there's more that could be done here to make it a believable part of canon.