Might and Magic VIII: Day of the Destroyer

Ten years ago the Kreegan invaded the world. The heroes of Might and Magic VI destroyed the Kreegan Queen, and the last of the Kreegan were wiped out over the course of Might and Magic VII: For Blood and Honor. The Ancients, however, anticipating disaster should the Kreegan manage to gain a foothold on the world, had already enacted a scorched earth plan: rather than let the world fall into the hands of their ancient enemies, they would see it destroyed outright. (wikipedia.org)