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The fictional villains of the Power Rangers universe that appeared in the television series Power Rangers Mystic Force are magical beings that dwell underground, known as the Forces of Darkness; they were also referred to as the Morlocks in promotional material, though this reference was never made in the show. Originally, the Forces of Darkness attempted to take over the magical world with their sights set on the human realm as well. But Leanbow, the strongest wizard of those to challenge them, cast a spell to banish them into the Underworld, sealing them for all eternity in a noble sacrifice. Years later, the seal was cracked and they resumed their campaign to finish what they had started.

All members of the Forces of Darkness appear in footage imported from Mystic Force ' s source material, the 2005 Super Sentai Mahou Sentai Magiranger, in which the characters comprise the Underground Hades Empire Infershia (albeit with different names).

The Supreme Master of the Underworld (Octomus) is the main antagonist of Mystic Force and the true leader of the Forces of Darkness and his minions revere him so much that he has only ever been referred to by his title. He contacts his minions via the white pool at the center of their lair, which turns red to signal his presence. His true form was revealed to be an immense Cthulhu-like demon with a skull-like face, many tentacles and dragon heads on the end of each tentacle, but usually only his right eye can be seen. His other eye is embedded in Koragg's shield, and one of his fangs was used to make Morticon's sword (which was taken by Koragg when Morticon was destroyed and forged into a new Knight Saber) and quite possibly some of his claws were given to Necrolai, her "Claws of the Master".

He was sealed in his Pit by the efforts of Leanbow at the end of the Great War, when the Forces of Darkness attempted to invade the Surface Realm, but he was able to transform his enemy into his most loyal servant Koragg the Knight Wolf beforehand. He was also responsible for dragging Catastros down to the Underworld. With the Forces of Darkness active once more, their sole motivation is to free their Master.

Hidiacs has not been a contender in any CBUB matches.