Might and Magic V: Darkside of Xeen is a science fantasy computer role-playing game, published and developed for multiple platforms by New World Computing in 1993. Based on the Might and Magic III: Isles of Terra game engine, it is the fifth game in the Might and Magic series, and is a direct sequel to Might and Magic IV: Clouds of Xeen, concluding the story arc started in the original Might and Magic: Secret of the Inner Sanctum.
Like its predecessors, it was well-received by both critics and players for its large game world and graphics, and was among the earliest games to make use of both animated cutscenes and PCM sound-based speech. Its unique integration mechanic with the game world of Clouds of Xeen, allowing both games to be played in a combined format - World of Xeen - was considered revolutionary at the time.
MM5 uses a game engine based on that used by Might and Magic III: Isles of Terra. General gameplay is very similar. Because it is designed to be played alongside MM4, with characters that have obtained some levels and other enhancements through play in Clouds of Xeen, gameplay is considerably more challenging for starting characters in MM5.
Darkside of Xeen concludes the story arc started by Might and Magic: Secret of the Inner Sanctum - the interstellar campaign against the Ancients' renegade creation, Sheltem. Picking up where Clouds of Xeen left off, the adventurers take King Burlock's advice and follow Prince Roland's trail to the other side of the world, where they find the rogue Guardian of Terra has already conquered its inhabitants, under the psuedonym of "Alamar" (the name of the king he impersonated on VARN in Might and Magic I).
Meanwhile, the Guardian of the Darkside - the Dragon Pharoah - contacts his rebel allies one by one, discovering that all have been imprisoned or converted to Sheltem's cause. In a desperate gambit, the Pharoah sends a dragon hatchling into the night skies of Darkside, carrying a command orb holding some of his power. The hatchling is killed in flight by a bolt of lightning, but the orb survives its fall to earth and is discovered by the adventurers. Passing through the city of Castleview, they scale the tower of the elven wizard Ellinger Hofenhager, an ally to the Pharoah.
Because Alamar moved the greatest city on Darkside, Castle Kalindra, out of phase with the physical realm of existence, Ellinger instructs the adventurers to gather enough energy discs to power a spell capable of restoring it to reality. They travel the realms of Darkside, liberating the city of Sandcaster from Alamar's sorcerer agents Morgana and Xenoc, collecting discs along the way. With Castle Kalindra restored by Ellinger, the heroes enter, only to find that Queen Kalindra has been defeated and captured by one of Alamar's minions, the vampire Count Blackfang.
Invading Castle Blackfang with the aid of the knight Ambrose and his griffin, the adventurers slay the Count only to find Kalindra has been turned into a vampire. They restore her from undeath using her lost crown's powers, and with her aid are able to reach the Ancients' pyramid where the Dragon Pharoah resides. After they return the Pharoah his command orb, he explains that Alamar holds the Ancients' Cube of Power, which enables him to direct the dual-sided nacelle world of XEEN (Xylonite Experimental Environment Nacelle) through the Void. Using the Cube, he plans to land Xeen on his homeworld, Terra, and continue his rampage against the empire of the Ancients.
The Pharoah reveals that when Alamar fell to Xeen in his "shooting star" (in actuality an escape pod), a second pod also landed, but was snared in the volcanic mountains of the northeast. Investigating this second pod, the adventurers discover Corak, Sheltem's nemesis from Might and Magic II and III. Corak instructs them to somehow teleport him into Castle Alamar so that he can put an end to his old enemy once and for all. The Dragon Pharoah leads them to the airborne city of Olympus, where they obtain a Soul Box.
Transferring Corak's essence into the Soul Box, they fight their way to Castle Alamar and, battling Sheltem's hordes, manage to reach his throne room. Casting the Soul Box inside, they retreat as Corak emerges to battle his old foe, though the two are evenly matched. After a destructive skirmish, Corak is defeated, but compels Sheltem towards him and sacrifices himself, initiating their dual self-destruct command. The resulting explosion of power destroys both Guardians along with Castle Alamar, bringing the threat of Sheltem to a bittersweet end.