First, My idea was that, after completely unlocking and beating every node in Warframe [unlocks arbitration's]
You will now unlock access to a 2nd option on every single boss node in warframe [Raid Mode]
This turns the boss in the mission up to level 150, and requires a 4 man squad to run.
In raid mode, boss's will drop 2x the loot, credits, and affinity, as well as arbitration mods, vitus essence, and 300 endo.
Maybe new blueprints or upgraded variants of loot they previous