Unidentified Sentinel variant

This Unidentified Sentinel variant was an extremely large Sentinel-like machine used by the Forerunners during the Forerunner-Flood War. It is the largest Sentinel variant observed to date, dwarfing the Strato-Sentinel in comparison. Its armament includes an extremely powerful energy weapon, capable of firing a lightning-fast energy beam at long range and producing an explosion powerful enough to level entire cities.

Trivia

 * The machine is only seen in the Halo Legends episode Origins.
 * It seems to be akin to the Enforcer Sentinel, although this unidentified one is much larger and has no visible shielding.
 * This Sentinel variant may be an adaptation of the Forerunner Tank, which was cut from Halo 2.