1. The Secret Boss — The Forgotten Ember
Location: Act 3, behind the waterfall in the Tower
In the Tower section of Act 3, there's a waterfall that looks like it might hide something. Swim through it and you'll find a hidden arena. In the center of the arena is a pedestal with a glowing ember. Interact with it to summon The Forgotten Ember — a secret boss that's harder than any of the main game bosses.
The Forgotten Ember has 3 phases and hits like a truck. It's optional, but defeating it rewards you with the "Ember's Heart" item, which gives you a permanent damage boost. The boss is weak to fire damage — ironic, given its name. Use fire abilities for double damage.
2. The Developer's Sword
Location: Act 1, hidden cave near the starting area
Near the starting area of Act 1, there's a rock wall that looks slightly different from the others. Attack it and it crumbles, revealing a hidden cave. Inside, there's a sword stuck in a stone — a reference to the King Arthur legend. Pull the sword to claim it.
The sword is called "The Developer's Blade" and it has a unique property: it deals bonus damage to bugs. Yes, bugs — the insect enemies in the Ember Forest take 3x damage from this sword. It's a joke about "debugging" the game. The sword also has a hidden stat: +10% critical hit chance.
3. The Dark Souls Reference
Location: Act 2, near the Warden boss arena
Before the Warden boss fight, there's a small alcove to the left of the arena entrance. Inside, there's a bonfire with a sword stuck in it — a direct reference to the bonfires from Dark Souls. If you interact with the bonfire, your character sits down and rests, restoring a small amount of health.
The bonfire can only be used once per visit to the area. After you use it, the fire goes out. But if you come back after defeating the Warden, the fire is lit again and you can use it a second time. It's a small but appreciated nod to FromSoftware's masterpiece.
4. The Hidden Song
Location: Act 4, the Core's music room
In the Core, there's a room with a set of musical instruments. If you interact with them in the right order — harp, drum, flute, horn — they play a hidden melody. The melody is the main theme of the game, but played in a different arrangement.
After you play the melody, a hidden door opens in the back of the room. Inside is a chest containing the "Melody of Embers" item, which unlocks a new ability: your attacks now have a chance to play a musical note on hit. It's purely cosmetic, but it's a fun reward for exploration.
5. The Kickstarter Backers' Shrine
Location: Act 2, hidden path in the Ember Forest
In the Ember Forest, there's a hidden path behind a large tree. The tree has a marking on it — a small symbol that looks like a flame. Follow the path to find a shrine dedicated to the game's Kickstarter backers. Their names are carved into the walls, and there's a chest in the center with a unique cosmetic item for each backer tier.
The shrine also has a guest book where you can leave a message. The messages are stored locally and persist across playthroughs. Some of the messages are from the developers themselves, thanking backers for their support.
6. The "Git Gud" Message
Location: Act 3, Tower, near a difficult platforming section
In the Tower, there's a notoriously difficult platforming section where you need to make a series of precise wall runs and dashes. At the end of the section, there's a message carved into the wall: "Git gud." It's a reference to the classic Dark Souls community phrase.
The message is written in the game's lore language, but if you've been collecting the lore tablets scattered throughout the game, you can translate it. The translation is: "Those who fall shall rise again. Those who rise shall fall no more." It's a surprisingly deep message hidden behind a meme.
7. The Secret Ending
Location: Final chapter, requires all 10 hidden collectibles
If you collect all 10 hidden collectibles across all acts, you unlock a secret ending. The collectibles are: the Ember's Heart (secret boss), the Developer's Blade (hidden cave), the Melody of Embers (music room), the Lore Tablet (Act 1), the Lore Tablet (Act 2), the Lore Tablet (Act 3), the Lore Tablet (Act 4), the Backer's Coin (shrine), the Ancient Key (Act 3), and the Final Ember (Act 4).
The secret ending shows a different perspective on the game's story. Without spoiling too much, it reveals that the Ember King isn't the real villain — there's a greater threat that's been manipulating events from behind the scenes. The ending sets up a potential sequel.
🏆 Final Pro Tip: The secret boss (The Forgotten Ember) is the hardest fight in the game. Come prepared with max upgrades and all abilities. The boss is weak to fire damage, so equip fire abilities before the fight. The reward — Ember's Heart — is worth it for the permanent damage boost.