I have found boss doors are locked that require the Carpenter's Key, the Millionaire's Key, and the Celestial Key, and maybe there are others. How and where can I find all of these keys, and any others I don't know about?

  • I've only found two of the four keys (Warhorse's Key is the fourth) so far and I don't even remember where the second was.
    – Powerlord
    Jun 23 '19 at 21:10
  • Oh, right, I forgot about that door because it shows up so early. I actually found the Carpenter's Key in my game, but I don't remember where it was either. Jun 23 '19 at 21:11
  • I think Carpenter's Key was along the main path through the game... maybe in the Secret Alchemy Lab?
    – Powerlord
    Jun 23 '19 at 21:18
  • I was able to get them all but wasn't really keeping track of them. All I remember really is that the last accessible key was the Millionaire's Key and is found in the last area of the game. Jun 25 '19 at 7:42

Most of the keys are late game items, so if you're not past 60-80% castle exploration, these will probably contain spoilers

  • Celeste's Key - Hall of Termination
    • When you exit the teleporter room, head straight up and then open a secret room in the ceiling
  • Carpenter's Key - Dian Cécht Cathedral
    • At the top of the right-most spire
    • Requires the Invert shard
  • Millionaire's Key - Behemoth's Den
    • From the entrance head left, then down, then right. Near the top of this room is a chest on a ledge that you need Invert or High Jump to reach
  • Warhorse's Key - Glacial Tomb
    • From the teleporter, head as far left as you can. A Gusion Cannon is obscuring the chest in the left-most room.
  • For the Millionaire's Key, where is entrance you are referring to?
    – Stevoisiak
    Jul 20 at 21:38

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