This line is said by N'Zoth
https://www.wowhead.com/news=289637/...atath-spoilers
Does he mean Fel-Chaos or Death or possibly something else?
Does this mean the Lich King/Calia or Illidan/Sargeras as Lightbound Servants
will return in an expansion soon to "cleanse" the world
and the Void will help us keep the current status quo instead?
Also we got updated Northrend maps in the new 8.1.5 build!
https://www.wowhead.com/news=289606/patch-8-1-5-ptr-build-28938-new-maps-arathi-basin-warsong-gulch-northrend
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While thinking about this, RIFT and Guild Wars 2 handle the problem of imbalance really well:
If any one of the 6 elements gets too much power, the world falls into ruin.
Even unbound Life itself can be a possible threat that way, not to mention the others:
https://telarapedia.gamepedia.com/Plane_of_Life
https://wiki.guildwars2.com/wiki/Mordremoth