Title says it all. BfA's major plot device and probably what is the expansion all about.
No I'm not talking about the TV Series or the thing you do with your gadgets like IPhone.
From saving Saurfang and freeing Talanji and Zul.
Freeing Jaina after being imprisoned in her homeland.
To putting and end in Ashvane's treason and piracy thus she and her gang get imprisoned only to be jail broken by Azshara and her nagas...
To N'Zoth's jail break soon to finally be realized!
Or liberating Mythraxx too inside his Voldun prison.
How would it connect with Vol'jin's mysterious break free from his "soul prison" urn and we found out it was empty?
Don't tell me the jailors too will somehow get involved i.e.
Bolvar
And Illidan?
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Updated OP with relevant videos for your viewing pleasure. Enjoy!