The history of the Shadow Isles
Some of you guys may know, I'm putting a lot of effort into making a new concept for a ghastly ranger in the Shadow Isles. A "Leave this place!" ranger who's tied to the cursed isles in the afterlife, trying still to protect them from further tampering. Thematically, I want to give her this sort of haunting/Slenderman kind of vibe, where you know she's there, but never really have a good way to judge exactly where, as she whittles away at your health and sanity enough that she can close in for the kill.
However, I've sort of hit a roadblock. I don't really have too much knowledge of the Blessed Isles before they were cursed. If there's any chance that you can refer me to the canon lore for exactly what happened, particularly in the events just before the Blessed Isles became cursed and known as the Shadow Isles, it'd be very beneficial to making sure I get the lore for my champion to fit correctly.