Devos
Here’s everything we know about how Frostmourne and the Helm of Domination are connected to the Shadowlands
In the Afterlives: Bastion short, Frostmourne appears to be able to rend souls in half.
Who is Devos? How did Uther the Lightbringer corrupt the Paragon of Loyalty?
Shadowlands brings back a lot of previous well-known World of Warcraft characters, but there are newly introduced characters to explore, too.