Elizabeth is the next heir to the alacucia (idk how you spell it) clan and she gave ronan that purple amulet that acts as an invitation to the clan. The winter vessel is important because she controls the power of her clan and she originally beats Elizabeth. She caused the eternal winter than was affecting the whole world and was essentially a pawn to the old hoe that was a bishop.
Do you mean the rainbow stuff as in the aura that the evil church people use? Ronans dad used a sword that absorbed the original owners power and he decided to make a new organization that follows what he believes in because the original wielder didn’t believe in viewing people differently because of their “value”. So the power that they use is a fraction of what the original dude had, the bishops are essentially cheap copies.
Grancia is the goat. He’s one of the first people Ronan beats when he comes to the school so they became rivals. They train to become stronger than the other and spar a couple of times. He’s also the dude that is in love with ronans older sister. He’s the noble of the grancia family
We don’t really know why the vampires are important just that the old ones are super strong and that one of ronans team members is an 86 yr old vampire and that she’s strong
The hiatuses and season breaks on these manhwas be getting me bc i l dont even remember why Elizabeth & the Winter vessel girl are important, why they fought, and tbh it doesn’t feel like it matters to me because it’s been so long.
I also don’t feel any closer to understand the og mystery involving haiyute and that sky rainbow stuff and
It’s just fanatic after fanatic after fanatic without us learning why he actually has this power
Who even is this Grancia guy? Why are the vampires important? I really dont remember