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Talanji Arc / Retaking plotline that was introduced in game via cinematics with bwonsamdi and Rasthakan
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Sylvanas /Anduin meeting at Arathi.
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Alleria/Turalyon torture horde civilians to find Sylvanas.
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Almost everything about sylvanas book filling Shadowlands gaps.
There’s plenty of examples about lore that was in books and it’s relevant for the current or future plotlines.