Titan (canceled game)/Concept art
From Halopedia, the Halo wiki
During the production of the now-cancelled Halo MMO known as "Titan", Ensemble Studios created a myriad of concept art for the game. During the development of "Titan", this art was developed to experiment with what would or would not work in the game and often displays massive variation from the traditional Halo style, but there is no guarantee any of the concepts on this page would have made their way to the final product. This page displays all known Halo MMO concept art.
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.
In 2008, former-Ensemble studios artist Dylan Cole uploaded several pieces of art depicting a Forerunner city/ structure of some kind, adding that they were for a project that was later cancelled. The more realistic style of these paintings is notable, due to their fairly radical departure from the "heroic stylised" artform applied to the other concepts seen for the game.