Titan (canceled game)

Features
The descriptions in the following sections are based on the gallery of images and, as such, might not be entirely accurate.

Classes
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Forerunner
Forerunners were intended to be a playable class.
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Marine
Marine was intended to be a human class.
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Mimic
A Mimic was an unknown female humanoid creature. Their name and concept art implies that the Mimic could shapeshift into various forms.
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PSI
PSIs were an intended class. It is unknown what their role was though they appear to be humans with some level of augmentations.
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Rogue
The Rogue was intended to be a human class. One may presume that these individuals were designed to have expertise in stealth combat as in other role-playing games.
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Spy
The Spy was intended to be a human class. One may presume that these individuals were designed to have expertise in espionage.
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Species
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Demons
Demons were an unknown alien race.
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Diggerz
Diggerz were an extra-terrestrial animal species. It appeared to be an armored, bioluminescent biped with clawed forearms that served to improve digging capabilities, hence its name.
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Jaggmaw Sailtail
The Jaggmaw Sailtail was an animal used for transporting characters around on their backs. It bore a notable physical resemblance to the Blind Wolf, a species that was cut from Halo: Combat Evolved.
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Mob
The Mob appear to have been intended to be a new species. The creature bears a strong resemblance to Earth's boars.
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Sentients
The Sentients appear to have been a new species. They appear to have been a humanoid species with mechanical attributes, such as reverse jointed limbs and visors for faces.
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Sigma
Sigmas were apparently a new species of extraterrestrials that were intended to appear in Titan. Some of the Sigmas seen in concept art are decidedly human in appearance, while others have more distinct alien features. Not much is known about them other than the male and female genders each had a distinctive physical appearance.
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Vehicles
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Aardvark
The Aardvark was a human vehicle intended to be featured in the cancelled Halo MMO. It resembles the Wolverine from Ensemble's later Halo Wars.
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Warthog
"2 Tickets to the Gun Show" was the developer name of a vehicle intended for inclusion in the untitled Halo MMO. A variant of the Warthog, it was apparently to be used by law enforcement, as evidenced by the word "POLICE" printed backwards on the hood of the vehicle. As can be seen in the concept art, there appear to be two seats mounted on the back of the vehicle, each with its own turret. This brings the passenger capacity of "2 Tickets to the Gun Show" to four.
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Grackle
The Grackle was a human motorcycle, which was going to be featured in the untitled Halo MMO
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Rhino
The Rhino was a human vehicle, intended to be featured in the canceled Halo MMO. It was intended to be used as a gunship. It bears a notable resemblance to the Pelican dropship, though with added missiles, rotary machine guns or autocannons, a thruster over its tail section, and enlarged wings with built-in ducted-air fans. It may have been the conceptual inspiration of the Sparrowhawk, a craft that ultimately filled a similar role in Halo Wars.
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Runner-class transport
The Runner-class transport was a Covenant naval vessel designed to transport the Hierarchs, known to be featured in Titan. One such Runner-class ship was known as the Throne Warden. It was completely manned by the Sangheili, and had a limited planet-to-planet travel distance, with no system-to-system slipspace drives.
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Scorpion tanks
Two Scorpion tank variants were intended for the cancelled Halo MMO. Both variants had more of a stylized design that caused the tank to closer resemble the animal from which the tank's moniker derives. The "Lash" Scorpion sports a brown/yellow color scheme and a longer "tail" whereas the "Venom" Scorpion sports a grey/blue color scheme and a shorter "tail".
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Forerunner Warthog-like vehicle
An unknown Forerunner Warthog-like vehicle was set to appear, depicted in several concept art. It is similar in appearance to the aforementioned Aardvark.
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Covenant aircraft
This Covenant aircraft was set to appear in the game. It would seemingly serve as a mobile aircraft platform, for deploying Banshee units.
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Forerunner combat armor
The Forerunner combat armor was an armored suit in the game. The armor was designed for Forerunner use but due to humans and Forerunners being the same in Titan, the armor could also be worn by humans.

Mjolnir combat armor
These unknown Mjolnir armor models were variations of MJOLNIR Powered Assault Armor for Spartans in the game. They superficially resemble the Mark VI, albeit with anime- or manga-like stylization. Several variations were designed, one of which had a chainsaw in place of the left hand.