To be honest I had vibes of The White Frost from The Witcher series, an unstoppable force of white (light here, ice/cold in Witcher) that will envelope everything. But I don't think SE took that from them and I wouldn't say SE took this idea from WoW either since we've had elemental calamities in lore described before WoW Cata. Maybe there was some inspirations, as Yoshida has said he's seen some things he liked, but I doubt it's to any level to give WoW full on credit for.

As long as SE is inspired about things that are cool I'm fine with whatever, like we all know they are greatly inspired by ancient history and at least I love that. Still doubt this expansion was a "oh look at Cata", but it wouldn't bother me if Yoshida did say Cata had some influence.

/shrug lol