The last surviving human-cyborg made the destroy the Covenant.
A multispecies army of aliens dedicated to wiping out the human race.
A highly sophisticated computer generated hologram capable of hacking into alien computers, troop movement and strategy.
Failing to prevent Halo's destruction, this alien commander allied with the humans to destroy the remaining Halos.
Small and weak, these aliens attack in groups to overwhelm their enemies.
This group of aliens carry energy shields to compensate for their physical weakness.
Incredibly strong and intelligent, these aliens are capable of using brute strength if nessecary, as well as cunning battlefield tactics.
The Covenant's heavy weapon, this group of aliens use a powerful fuel rod gun integtrated directly into their armor. They also carry a strong shield made of unknown alloy, which they sometimes use as a melee weapon.
Halo was designed to contain this parasite. But the Covenant discovered it and the parasite mutated most of the life on Halo.
The Pillar of Autumn
Fleeing from the Covenant fleet, this Halcyon starship made a crash landing on the ring world of Halo.
A major establishment on another planet made by the humans, the Covenant invaded and conquered this planet forcing the survivors to flee.
Truth and Reconciliation
This Covenant cruiser was disabled and later boarded by the crew of the Pillar of Autumn.
The Silent Cartographer
This object is a holographic map room which shows all of Halo's contents, including its control room.
Similar fighters like Elites except used as guards, these aliens are physically stronger and wilder than Elites.
Weak but nimble, this species has a very insectiod appearance, as well as a limited ability to fly.
This group of aliens are never present at any battles; they are rather religious and political rulers.