After the corrupt Guardian Sheltem was defeated, the seemingly never-ending war between the Ancients and the alien Kreegans entered a new phase. Meteor-like spaceships populated by the Kreegans fell onto the technologically less advanced planet Enroth. The local king, Roland Ironfist, plans to attack the demonic-looking aliens, but is betrayed by a mage named Sulman and gone missing. Xenofex, the king of the Kreegans, establishes a cult teaching people that the Ironfist dynasty has lost its Mandate of Heaven to rule the realm. Meanwhile, the town of Sweet Water is invaded by the Kreegans, and four adventurers become involved in the battle and the search for the missing king.
The Mandate of Heaven is the sixth installment in the Might and Magic series, and the first one with the playing area done with a real 3D engine, allowing free exploration of the terrain (as opposed to the grid-based movement of the previous games) and camera rotation. Characters and many objects are represented by 2D sprites. The gameplay follows the formula of the predecessors with several changes, the most notable of which is the option to fight in real time. Real-time combat allows free movement, while the traditional turn-based one is stationary.
Character creation is somewhat more restricted: there are no other races but humans to choose from, and the party contains only four adventurers. Six classes are available: Knight, Druid, Paladin, Cleric, Sorcerer and Archer. A new skill system has been introduced, allowing the player to manually raise character skills (e.g. proficiency in specific weapon types) when the character levels up. Characters also gain access to skills of most classes, regardless of their original class designation.