Combination artifacts are sets of artifacts that give certain bonuses, when all of them are equipped. This concept was firs introduced in Heroes of Might and Magic III: The Shadow of Death expansion, where all artifacts needed for combination, when equipped merged into super artifact, that had bonuses of all artifacts, used to make them, plus special ability. In the Heroes of Might and Magic IV expansion, the Gathering Storm combination artifacts granted spells cast on hero in combat. In Heroes of Might and Magic V this concept was renamed to artifact sets and various bonuses to hero's troops, plus special bonus for certain classes.