With the release of the Dark Nexus event following the comic we were given two skins, being Dark Nexus Alarak and Dark Nexus Gul'dan. In the comic we see that these two heroes are serving the Raven Lord, while the Grave Keeper only has one hero, being Malthael with his Grave Warden skin. The next part of the comic will most likely have something to do with the Grave Keeper, based on how it was left off in part one. Considering how the Raven Lord has two heroes by his side in this fight, it would only make sense for the Grave Keeper to have two as well. Perhaps a hero we don't know of yet?
Please help.
I didn't find the right solution from the Internet.