From Origins: Part 1, the Forerunners going to war.
The battle in "The Duel". One Arbiter vs. Hundreds of Covenant, including a wraith and 3 supersized Hunters? Curb-Stomp Battle on the troops, 3-0 against the Hunters, and I'm pretty sure he took out one by throwing the Wraith at it...
Prototype. A marine uses a prototype, upscaled Mjolnir suit with built in weapons, and uses the time left before it's self-destruct mechanism activates to allow his men to escape. The suit resembles a Gundam, in both appearence and the improbable amount of Covenent it takes out. Badass on so many levels.
To be precise, it's actually based on one of the Marauder Suits from Starship Troopers, both in design and combat style.
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