Keep the Hallowed Flame alive in Warframe during the Halloween event.
Doing so will yield you the exclusive Naberus Ephemera. You’ll have to find Zealoid, destroy him, and take possession of the Hallowed Flame. Keep it charged by killing enemies and earn rewards:
Mission 1: Orokin Catalyst Mission 2: Forma Mission 3: Aura Forma Mission 4: Naberus Ephemera and Stratos Emblem
The event is live until November 1 at 2p ET. Learn more here.