Oh the splash art btw for anyone wondering. The dude on the left is the thing that comes out of water rifts. No word yet on when we might see him or who he is. I don't think he's one of the bosses in Mount Sharax, it sounds like he may be a Volan type boss later on. The dude on the right is the Akvani demon Martodraum, the main protagonist of the expansion (at this point anyways). I haven't seen confirmation but I would guess he is the main boss in Mount Sharax.