I know this is impossible for Halo 4 but maybe for Halo 5/6 I thought of a game mode that would revolve around the mammoth.
Red team would have to guide the mammoth through a large map and destroy 2-4 bases.
Blue team would have to destroy the mammoth before it destroys their bases.
Of course the mammoth would be tweaked so it can be destroyed with some effort. There would be a good amount of vehicles for blue team. Would also be nice to have elites back.
I think it would be possible to have one in H4 as part of one of the map packs but it would be similar to the one in-game. Not drivable by players, but drives along a set path around the map via AI (maybe Roland even).
Blue team can set up turrets to destroy the Mammoth and the Reds can use the target locater and Mammoth mac to destroy them.
Another idea could be that both teams get a mammoth and both teams will kill eachother to get points. These points can be spent to spawn vehicles inside the Mammoth, upgrade the Mammoth or fire a mac blast at the enemy Mammoth. Crazy I know but it would be like a mini halo wars.
All I’m really asking for is to see it come back at all. The last thing we need is another one time campaign vehicle.
A multiplayer Mammoth in any form would be nice, but I really would have liked them to have remade Sandtrap but with Mammoths instead of Elephants. It could have even doubled up as a forge environment.