From the blog "News"

DEFENDERS! Today we released the PRIME INCURSIONS update on all platforms! We wanted to provide a challenge to our tested Defenders that was separate from Onslaught, and Prime Incursions are just that. There’s a lot to unpack here, so let’s get into it! PRIME INCURSIONS What are they? They are the highest and newest tier of incursions, selectable from the Incursions tab on the War Table. There are six different groups of incursions to play through that are releasing over