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Another of the Mega Monsters employed by the alien warlords from Mega in their attempt to conquer the Earth. Of all of their champions, Rhiahn was perhaps the most bizarre, and the most deadly. During the mass battle in Salt Lake City, Rhiahn repeatedly attacked Godzilla, carrying the immense reptile clenched in his gigantic jaws. More, it was Rhiahn who removed Red Ronin from the conflict, severing the robot's head with his anterior bio-blades and leaving Godzilla alone to face all three Mega Monsters.
Of all the Mega Monsters, Rhiahn is the most direct, preferring to strike an enemy with his gigantic jaws and clawed arms in a more obvious manner than the stalking and lurking tactics of Triax and Krollar. Rhiahn is easily driven off by injury, he lacks the extreme durability of Triax in this regard, but the monster is quick to recover and swift to return to the attack. Rhiahn is extremely tenacious in his attacks and once an enemy has provoked him, the alien monster will fight back relentlessly until one of them has been vanquished.
Rhiahn, like his fellow Mega Monsters, is able to survive in the vacuum of space without any protection. The monster's massive fly-trap like mouth is capable of a tenacious grip that is unbreakable unless Rhiahn himself can be induced to release it. The monster's most unique weapon, however, are his anterior bio-blades, cybernetic devices that allow Rhiahn to hover and fly in the manner of a helicopter, and which can also be employed as an actual weapon, whirring at such a speed that they cut through objects like a gigantic buzz saw.