It is called "Ultimate Primus", and it is the "Ultimate Armor" that was released a few months ago. You cannot get it any longer. There is no Wiki page for it as yet, since its stats keep increasing with each passing month (it has 20 total Ascension levels instead of the usual 10, and it gets 2 per month for.. I believe 2 more months after August).
The next Ultimate Armor coming up (name is not yet known) can only be obtained if you have the Exclusive armor for the past 2 months (June and July) and the next 3 (August, September, October). If you do not have all 5 of the Exclusives, you cannot get the next Ultimate Armor.