HRUNTING/YGGDRASIL Mark II [D] Mega-Mantis
From Halopedia, the Halo wiki
The HRUNTING/YGGDRASIL Mark II [D] Armor Defense System, sometimes known colloquially as the mega-Mantis, is a powered exoskeleton developed by the Materials Group. It is part of the HRUNTING/YGGDRASIL lineage, which began with the suit-like Mark I and later produced the Mark IX "Mantis". Like the Mantis, it is armed with a multi-barreled cannon on its right boom and an array of missile launchers on the other. A next-generation successor to the Mark II [D] was eventually developed by Hannibal and the Materials Group, known as the Mark II [J] and commonly nicknamed the "Colossus".
A Mark II [D] aboard the freighter CAA Heavy Burden serves as the centerpiece of the Halo 4 multiplayer map Adrift. In an interview Frank O'Connor called the mech a "Cyclops Mark II", referring to the Cyclops from Halo Wars. However, Halo 4: The Essential Visual Guide makes no mention of this name. Since "Cyclops" is merely a colloquialism for the HRUNTING Mark III [B], itself derived from the third-generation exoskeleton that predated MJOLNIR, the "Cyclops Mark II" moniker was probably used only from a game-design perspective rather than having any canonical significance.
List of appearances