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  "description": "The Lantern Key drops from a specific Act event path and unlocks a separate Act 3 event reward.",
  "path": "/slay-the-spire-2-lantern-key-location-and-act-3-use/",
  "publishedAt": "2026-03-09T08:31:43.000Z",
  "site": "https://allthings.how",
  "tags": [
    "@Ethan"
  ],
  "textContent": "The Lantern Key in _Slay the Spire 2_ is a run-specific item tied to an event chain, not a permanent progression key. You pick it up after defeating an event enemy, then spend it later at a `?` room in the first half of Act 3.\n\n🔑\n\nThe Lantern Key is obtained from the Mysterious Knight event in Act 1, and it is used at a Act 3 ? event tied to the caged character encounter.\n\nImage credit: __Mega Crit__\n\n* * *\n\n### Lantern Key trigger\n\nThe key is awarded when you complete the Mysterious Knight event and take the Lantern Key. The important part is that it comes from an event encounter rather than a chest, shop, or standard combat reward.\n\nIf you leave that event without taking the Lantern Key, the later Act 3 interaction does not open. The item is attached to the current run, so dying before reaching the later event ends that attempt, and the key is lost with the run.\n\nThe key is awarded when you complete the Mysterious Knight event | Image credit: __Mega Crit (via YouTube/@Ethan Chambers)__\n\n* * *\n\n### Where to use the Lantern Key\n\nThe Lantern Key is used in Act 3, specifically in the first half of the act, at a `?` tile event. That event is the one associated with the figure in a cage.\n\nThe practical takeaway is simple. If you have the Lantern Key, route toward early Act 3 unknown rooms instead of expecting the item to activate automatically after a boss, elite, or treasure room.\n\nImage credit: __Mega Crit (via YouTube/@Ethan Chambers)__\n\n* * *\n\n### What the Lantern Key event gives you\n\nUsing the Lantern Key at the Act 3 event opens a reward choice. One option grants a relic that repeats the last card played on the previous turn for free.\n\nThe other known option gives two random relics and two potions. Both outcomes come from the same Act 3 event, with the key acting as the condition that unlocks it.\n\n* * *\n\n### How to tell it worked\n\nYou will know the Lantern Key has paid off when the special Act 3 `?` event appears and offers the key-based reward choice. If you reach that event and receive the relic-or-relics decision, the trigger worked correctly.\n\nIf you never took the Lantern Key earlier in the run, that payoff does not happen.\n\n* * *\n\n### Lantern Key facts that matter for routing\n\nPoint | What it means\n---|---\nHow you get it | From the Mysterious Knight event after defeating the event enemy and taking the Lantern Key\nWhen you use it | In the first half of Act 3\nWhere you use it | At a `?` tile event connected to the caged character\nPrimary reward path | A relic that repeats the last card played on the previous turn for free\nAlternate reward path | Two random relics plus two potions\nPersistence | It applies only to the current run\n\n* * *\n\n### What not to confuse it with\n\nThe Lantern Key is separate from the key system in the original _Slay the Spire_ , where Ruby, Emerald, and Sapphire Keys are used to reach Act 4. It is a different item with a different purpose inside _Slay the Spire 2_.\n\nThat distinction matters because the Lantern Key does not function like a broad account unlock or an endgame gate. It is an event item that changes one later event outcome inside the same run.\n\nImage credit: __Mega Crit__\n\n* * *\n\nIf you are holding the Lantern Key, the cleanest play is to treat early Act 3 `?` rooms as part of your route plan. That is the point where the item converts from a dead inventory piece into a real reward.",
  "title": "Slay the Spire 2 Lantern Key location and Act 3 use",
  "updatedAt": "2026-03-09T08:31:44.773Z"
}