HRUNTING/YGGDRASIL Mark II (J) Colossus

"If it's on the ground I'll take it out."

- A Colossus pilot during the Banished occupation of Installation 00.

The HRUNTING/YGGDRASIL Mark II [J] Armor Defense System, colloquially known as the Colossus, is a powered exoskeleton used by the UNSC Army, and the crew of the  during the Second Ark Conflict in 2559.

Design details
The Colossus is a next-generation exoskeleton combat unit designed by Materials Group and Hannibal Weapon Systems for the UNSC Army. It is relatively slow, but fitted with a devastating arsenal, capable of taking down almost any foe. The Colossus is a successor to an older exoskeleton in the same line, the HRUNTING/YGGDRASIL Mark II [D] Armor Defence System.

Armaments
The Colossus' primary weapon is a long-range heavy railgun, a massive weapon originally designed for installation on fortified structures. While the rail cannon can only target ground units, its autocannon has an all—environment engagement profile. After upgrades, the Colossus can use Stomp, sending out a shockwave that stuns and damages enemy ground units.

Operational history
"I have a wonderful lack of guilt."

- A Colossus pilot after killing Banished forces on Installation 00.

Isabel retains its manufacturing templates from her supply-chain training on Earth, though manufacturing these massive combat machines represented a considerable burden on the 's supplies. By May 2559, at least one Colossus was used by Sunray 1-1 during Operation: SPEARBREAKER in their efforts to halt Colony's plan.

Non-canon history
Sergeant Johnson claims to have acquired the materials for his Colossus units via the classic Marine Corps logistical expediency of 'borrowing' equipment that isn't nailed down [or couldn't be pried free], but his actual source for these machines is a mystery wrapped in an enigma, protected by shield generators and several tons of Titanium—A armor plating.

Halo Wars 2
Colossus Upgrade: Stomp Colossus drop (Only avaiable in Operation: SPEARBREAKER) In Halo Wars 2, Colossi can be built at the UNSC Garage by Avery Johnson in place of M808S Scorpions. Un-upgraded Colossi are effective against vehicles, okay against infantry and structures, and do poorly against aircraft. Once upgraded with the Stomp ability, the Colossus will perform well against infantry. In Blitz, they cost 140 energy. On Operation: SPEARBREAKER, a Colossus can be requested within personnel drop zones free of population cost, but it can only be deployed one at the time, while the deployment time takes at least 5 seconds upon request, faster than standard Colossus. It is also already upgraded with stomp, to shut down the recharging network on the Forerunner ship.
 * Info: Heavy Mech, Powerful long range heavy unit, Autocannons attack all targets, Heavy Railgun attacks ground targets form huge distances
 * Tier: 3
 * Cost: Population 9, Supplies 750, Power 120
 * Info: New ability, Unlocks Stomp Ability, Sends out a shockwave that stuns and damages enemy ground units.
 * Tier: 3
 * Cost: Supplies 0, Power 900
 * Info: Heavy Mech, Powerful long range heavy unit, Autocannons attack all targets, Heavy Railgun attacks ground targets form huge distances, can stomp the ground nearby to devastating effect. Only one unit deployed at a time.
 * Tier: 0
 * Cost: Population 0, Supplies 800, Power 200

List of appearances

 * Halo Wars 2
 * Halo: Official Spartan Field Manual