They are having a challenge if your team can beat the new raid boss you get a prize. So I was wondering if we use our own characters or premades.

Do we need our security key for the event or is it premade characters?

I just leveled up to Command Level 93, suddenly my armor, which was 5 pieces of MK-3 lost the bonuses from the Chestguard and Greaves. So I'm only getting the bonus from the gauntlets, belt and armguards. It now says I need a combination of Ultimate Exarch and MK-3? Can't find anything on this so any help would be appreciated.