Some of the best side activities you can embark upon in Horizon Forbidden West are the Cauldrons. These techno-heavy, dungeon-like bases are the factories that create the deadly robot animals that populate the Horizon games. If you can get into one and find its core, however, you can unlock the opportunity to hack those machines, temporarily turning them into allies in battle, or even mounts you can ride around the game world to get to places more quickly.
There are a handful of Cauldrons in Forbidden West, and while you'll hit a few as part of the game's story, several require you to find them on your own. They're also a bit of an undertaking--once you enter a Cauldron, you have to complete it before you can travel Forbidden West's open world yet again.
Each Cauldron contains the Override codes for several different kinds of machines you'll encounter in the wild. Some you'll unlock right away for completing the Cauldron, while some are «corrupted,» and require you to kill additional machines of that type in the world to gather specific components that'll let you to completely unlock the Override. You can complete those Corrupted Overrides in the Base, once you've unlocked it early in the game.
Here's a complete rundown of all the Cauldrons in Forbidden West and a list of what machines you'll be able to Override once you've completed them. Note that there are some light story spoilers contained herein, as a few locations are accessible only as part of the main quest. We won't give anything away, but if you'd prefer not to know anything about where the story will take you, you might not want to read further.
It's worth noting that while you'll have several Cauldrons to find by the end of the game, you won't be able to
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