After collecting the Red and Blue Keys, the Yellow Key is the final piece needed to open the massive gate leading to the Nushi’s Lair in Beast of Reincarnation. Although the game points you toward Tailwater Village, the exact steps for obtaining the key can be slightly confusing because you must first acquire another item and defeat an enemy before the Yellow Key becomes available.
This guide explains exactly where to find the Yellow Key, how to obtain it, every place where it can be used, and whether there are any missable rewards tied to it.
Beast of Reincarnation Yellow Key overview
| Item | Details |
|---|---|
| Key | Yellow Key |
| Region | Ogouchi Buffer Zone |
| Main Story | Chapter 1 |
| Required? | Yes |
| First Location | Cave north of Tailwater Village |
| Unlocks | Nushi’s Lair gate and an optional locked building |
| Missable? | No, but optional loot should be collected before advancing |
Where to find the Yellow Key in Beast of Reincarnation
The Yellow Key is located in the Ogouchi Buffer Zone, specifically through the cave found north of Tailwater Village. The story eventually directs you toward this area after you’ve begun searching for the three colored keys needed to open the Nushi’s Lair.
Unlike the Red Key, which is obtained automatically during the story, and the Blue Key, which is found in another part of the zone, the Yellow Key requires completing a small encounter inside the cave before it becomes available.
The entire objective takes place around Tailwater Village and the cave immediately to its north. Inside the cave, you’ll encounter a beast guarding the route forward. After defeating it, you’ll receive the Tailwater Key, which opens the sealed door deeper inside the cave. Beyond that door is the guardian who rewards you with the Yellow Key.
How to get the Yellow Key in Beast of Reincarnation
Travel to Tailwater Village in the Ogouchi Buffer Zone during Chapter 1. Head north of the village until you find the cave entrance. Enter the cave and defeat the beast guarding the path.
Upon victory, the enemy drops the Tailwater Key. Use the Tailwater Key to unlock the door deeper inside the cave.
Continue into the newly opened chamber and speak with the guardian waiting inside. The guardian rewards you with the Yellow Key, completing your collection of the third colored key required for the story.
What does the Yellow Key unlock?
The Yellow Key has two important uses.
The primary purpose is unlocking one of the three locks sealing the entrance to the Nushi’s Lair. Once you’ve gathered the Red, Blue, and Yellow Keys, you can return to the large gate near the Nushi’s Lair entrance and open it to continue Chapter 1.
The key also opens an optional locked building north of the river. Inside is one of the area’s Strongboxes containing valuable loot, making it worthwhile to revisit before progressing the main story.
Yellow Key rewards
| Reward | How to obtain |
|---|---|
| Tailwater Key | Defeat the beast inside the cave |
| Yellow Key | Speak with the guardian after opening the cave door |
| Story Progress | Opens the final lock at the Nushi’s Lair |
| Optional Strongbox | Unlock the building north of the river |
Should you explore before opening the Nushi’s Lair?
Yes. While obtaining the Yellow Key itself is mandatory, opening the Nushi’s Lair advances the main story. Before using all three colored keys, it’s a good idea to finish exploring the Ogouchi Buffer Zone, collect Strongboxes, Documents, Manuals, Campsites, and any remaining collectibles you may have missed. Several guides recommend clearing the area before moving forward to avoid unnecessary backtracking.
Is there lore connected to the Yellow Key?
Yes. Players interested in the game’s environmental storytelling can find a document related to the former bearer of the Yellow Key inside Subcity 02. While this isn’t required for progression, it expands on the background surrounding the key and its guardian.
| Tip | Why it helps |
|---|---|
| Defeat the cave beast first | It drops the Tailwater Key needed for progression |
| Don’t leave after getting the Tailwater Key | The Yellow Key is obtained deeper inside the cave |
| Unlock the optional building afterward | You’ll gain access to an extra Strongbox |
| Finish exploration before opening the Nushi’s Lair | Story progression begins after using all three keys |
The Yellow Key is the last major key item you’ll collect before entering the Nushi’s Lair. Although obtaining it is fairly straightforward once you reach Tailwater Village, it’s easy to overlook the optional Strongbox that also requires this key. Since opening the Nushi’s Lair continues the main story, it’s worth taking a few extra minutes to revisit locked doors, collect remaining valuables, and complete any exploration objectives before moving on.
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