mark_kiple
Concerning the ring of the dark dimension you should give it to Gilles de Rais. According to historians, he was the richest man in France and the best friend of the Pucelle (nickname of Jeanne d'Arc which means the virgin ). He was the one who financed her military campaign, even to the point of financial ruin. He also tried everything to save her from the English but the king of France did not want to. He finally received the title of marshal but was not reimbursed for his wealth lost for the war as well as for crowning the king.He eventually went crazy and turned into a murderous psychopath (satanic ritual, murder of hundreds of children, necrophilia etc). The dark dimension also tends to transform its contractors into psychopaths if they do not have a contractor from the light dimension nearby. This would push Jeanne d'Arc to stay with Gilles to restrain Gilles' murderous impulses. (I'm a French student in history if you want to ask me questions about this period don't hesitate)
I like the idea of the rings, but they need to be nerfed initially, then have the MC upgrade them as he gets stronger. doesn't make any sense for MC in his powerless state (no access to the cosmic power) to make rings that are so OP. not to mention a bunch of those dimensions already have rulers who control the majority of the power, so the ring wearer wouldn't be able to manipulate much.