What is that Elite ad from the Halo Channel?

Games Halo 5: Guardians
1

I’m rewatching Halo Nightfall and twice I’ve seen the ad depicting Elites fighting each other at some sort of Sanghelli ancient ruins sight. Is this Halo 5 related?

2

There is a war going on between the Storm Covenant and the Swords of Sanghelios in Halo 5. I don’t know if that’s the clip you saw though.

3

Is… is it the arbiter trailer for killer instinct? This one?

That’s all I can think it would be.

4

Is it the killer instinct trailer, because that game lets you play as the arbiter as well as change your skin to different kind of elites. And theres a Halo arena to play in.