I haven’t seen anyone here on the forums make a thread about it, but Classic SoD has a lot of new lore. I wanted to make a thread to compile it all. Feel free to add any examples you find.
Credit to one of my Twitter friends for bringing a lot of this to my attention.
The Tauren Rogue Boarten Shadetotem, who Thunder Bluff Guards tell you claims he was there the whole time, shows up in Classic SoD and gives Tauren Shamans quests to gain dual-wielding and Lava Lash.
Comprehension charms, which are used by mages to unlock scrolls, can be earned by tearning in books you find throughout the world. Some of them reference TCG characters, like Ta’zo the troll mage or Rumi, the Gnome mage. One references Nar’thalas.
Priests of each race have a quest to meet a supplicant from another race on their faction who wants to convert to their race’s religion. You see a human worshipping Elune, a Night Elf turning to the Light, a Troll meditating on “undeath,” and a Forsaken trying to bargain with a Loa. These are part of the “Sharing the Faith quests.”
https://www.wowhead.com/classic/quest=79078/sharing-the-faith
https://www.wowhead.com/classic/quest=79077/sharing-the-faith
https://www.wowhead.com/classic/quest=79079/sharing-the-faith
https://www.wowhead.com/classic/quest=79080/sharing-the-faith
There’s also a new questline to create Void-infused armaments.
You find a mysterious entity that is implied to be Xala’tath.
You can also find a shard of Light, a white crystal, which one Tauren believes may have been a tear shed by An’she.