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Aloy: "Where can I find this Cauldron?"
Dral: "It's dead north of here, past the Red Drifts, built into the side of a mountain."
Mother's Crown

Cauldron SIGMA is an activity in Horizon Zero Dawn. It is a HEPHAESTUS facility that manufactures machines for use in terraforming. It is located north of Mother's Heart and situated inside a mountain.


The entrance to SIGMA is a large triangular door, guarded by several Watchers. The interior of the Cauldron is a large, dimly lit maze of chambers and tunnels, with masses of metal and wires that make up the walls, floors, and ceiling. A large amount of automated machinery can be seen working to assemble parts. Aloy must utilize her agility and override tool to navigate the mazes and puzzles of the Cauldron, whilst avoiding or combating the machines roaming inside. The core area is a large circular room where a Fire Bellowback is being assembled inside a force field, guarded by Watchers.

Despite being a machine factory, Aloy can find a number of triangular crates containing vital resources, as well as medicinal fungi. In place of tall grass are vents that can be damaged to create concealing steam clouds. The boss that protects the core is a Fire Bellowback. Once Aloy uses her override on a nearby pillar, the force field will drop and the machine will attack, accompanied by several Watchers. Aloy will have to defeat all machines in the area to access the core and leave.

SIGMA Overrides


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

Text Datapoints - Machine

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