History of Zero Hour

Overview

Zero Hour is an Exotic Mission in the Old Tower (The Last City / The Farm) where you stop House of Salvation Fallen from stealing a dangerous weapon. It originally released with Forsaken-era SIVA content; the original unlock was the Enemy of My Enemy quest on Titan, the Fallen Transponder from The Rig, and activating six nodes on Earth and Nessus, then meeting Mithrax in the Farm. It was later reprised in Into the Light. The current unlock is the Asset Protection quest from Ada-1, then launching it from the Into the Light node. Sources differ on timers: 40 minutes on Normal and 20 on Legend in the reprise; the original had a 20-minute limit.

Encounters and mechanics

Fight through courtyards, hangars, a ventilation shaft with rotating turbines and exploding Shanks, then a room where four switches must be hit while the sweeper bot TR3-VR patrols, and a weekly-rotating burning-floor puzzle. The boss is Siriks of House Salvation in the Tower Ruins, with servitors, tanks, Shanks and a final Brig. Shielded foes make matching elements useful.

Rewards

Outbreak Perfected (craftable in the reprise) plus the listed weapons and Eutechnology armor from the reprise loot pool. See Zero Hour (Heroic) and Zero Hour (Expert).