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Cauldron ZETA is an activity in Horizon Zero Dawn. It is a HEPHAESTUS facility that manufactures machines for use in terraforming.


ZETA's entryway differs from other Cauldrons in that the primary entrance is sealed and guarded by three Stalkers. The true entrance is above and to the left, guarded by a single Redeye Watcher. Around the primary entrance there will be many red flare alarm signals which will alarm the Stalkers, if you happened to walk in vicinity of those signals. Once tripped, all three Stalkers will converge on the tripped alarm signal position.


The interior is similar to other Cauldrons, but lacks any sort of puzzle or enemies until you reach the core. The core will house a Thunderjaw being assembled, with two active Watchers guarding it. The Thunderjaw will attack upon being released by an override to the facility's central processor. Simply climb an energy emission tower and override it.

The interior is littered with pyramid-shaped supply crates which contained many resources. There are also many Medicinal Grey Omen scattered around the interior.

ZETA Overrides


The following datapoints are obtained automatically during this quest and cannot be missed.

Text Datapoints - Machine


  • In its corresponding datapoint, this Cauldron is referred to as Cauldron THETA.


Horizon Zero Dawn Quests
Main Quest A Gift from the Past - Lessons of the Wild - The Point of the Spear - Mother's Heart - The Proving - The Womb of the Mountain - A Seeker at the Gates - The War-Chief's Trail - Revenge of the Nora - The City of the Sun - The Field of the Fallen - Into the Borderlands - The Sun Shall Fall - Maker's End - The Grave-Hoard - To Curse the Darkness - Deep Secrets of the Earth - The Terror of the Sun - The Heart of the Nora - The Mountain That Fell - The Looming Shadow - The Face of Extinction
Side Quests A Daughter's Vengeance - A Moment's Peace - Acquired Taste - Ancient Armory - Blood on Stone - Cause for Concern - Farewell - Death from the Skies - Fatal Inheritance - Heap of Trouble - Honor The Fallen - Hunters' Blind - In Her Mother's Footsteps - Insult to Injury - Queen's Gambit - Redmaw - Robbing the Rich - Sun and Shadow - Sunstone Rock - The Forgotten - Traitor's Bounty - Underequipped - Weapons of the Lodge
Errands A Curious Proposal - Collateral - Deadliest Game - Demand and Supply - Hammer and Steel - Healer's Oath - Hunting for the Lodge - In Foreign Lands - Luck of the Hunt - Odd Grata - Sanctuary - Shortage of Supplies - Sun's Judgment - To Old Acquaintance
Activities Bandit Camps Blackwing Snag - Devil's Thirst - Gatelands - Hollow Fort - Shattered Kiln - Stone YieldFW - Two-Teeth
Cauldrons Cauldron RHO - Cauldron SIGMA - Cauldron XI - Cauldron ZETA
Corrupted Zones Corrupted Zones
Hunting Grounds Greatrun - Nora - SnowchantsFW - Spurflints - Sun Furrows - Valleymeet
Tallnecks Devil's Thirst - Copper Deeps - FrostfiguresFW - Rustwash - Spearshafts - Sun-Steps
Horizon Zero Dawn: The Frozen Wilds Quests
Side Quests Firebreak - For the Werak - Frontier Justice - Into the Frozen Wilds - The Forge of Winter - The Hunters Three - The Shaman's Path - The Survivor - Waterlogged
Errands A Secret Shared - Ikrie's Challenge - Geared Up: Forgefire - Geared Up: Icerail - Geared Up: Stormslinger - Out of the Forge - The Claws Beneath