Nightfall is Shield Brothers with the following:

Brawler, Chaff(no radar), and Exposure. There is also a new modifier (for me at least) called Match Game: Enemy shields are resistant to unmatched elemental damage. I am assuming this means if its a solar shield, you have to use solar weapons and so forth.

Looks like this will be a good time to give this Suzanoo a run for its money.

Also Kagoor and her Ogre are the Court of Oryx Tier 3.