Sales of Diablo III: Reaper of Souls are in already excess of 2.7 million copies in just one week.
Blizzard has just announced the figure, which includes both physical and digital copies of the expansion.
In addition, Maltheal, the Angel of Death and the expansion's antagonist, has been defeated more than 1.5 million times.
“With Reaper of Souls, we wanted to emphasise all the things that Diablo gamers have always loved about the series, from the dark gothic setting to the piles and piles of epic loot,” said Blizzard CEO and co-founder Mike Morhaime.
“We’re excited to see that players are enjoying the changes we’ve made to the game, and we look forward to achieving our Paragon levels alongside everyone else in the weeks and months ahead.”