Aside from being another source for endgame gear, Delves also provide a challenge for players to overcome. For one reason or another, there is always a big bad that is an exclusive antagonist for each season of Delve content. For the first season of World of Warcraft: The War Within, that Nemesis was Zekvir. Since the second season is all about the Undermine, the Nemesis this time around is a goblin named the Underpin. He uses a powerful mech equipped with an incredibly deadly arsenal. While he isn't as tough as Zekvir, the Underpin can be a difficult foe to overcome as there are so many things that can go wrong.