Diablo 2 player discovers the key to immortality on the new warlock class is to use a pet demon as a shield

A little over a week into Diablo 2's first expansion in 25 years and people have already figured out how to break the new warlock class. By most accounts, warlocks are easily the strongest class in the game for how easy it is to put together a devastating build, but YouTuber Coooley wanted something better than big damage numbers: immortality.

They figured it out, and were surprised that it's more straightforward to achieve than it might seem. Blizzard pitched the class as a summoner who...