Completing a chapter in Tower of Fantasy feels like cracking open a treasure chest overflowing with goodies—from potent Omnium Crystals for leveling up, to valuable Gold Nuclei for the permanent banner, and the coveted premium currency, Dark Crystals. However, snagging these rewards isn't always a straight shot down the main road. Each chapter has a few mandatory side quests that act as hidden keys, and if you miss them, you're left staring at an incomplete progress bar. One such elusive quest is 'Ark', a hidden requirement for fully wrapping up Chapter 4 in the Aesperia region. Think of it as the game's way of hiding the final piece of a puzzle in plain sight—frustrating if you don't know where to look, but a satisfying 'aha!' moment once you find it.

Step 1: The Mysterious Letter - Your Quest's Spark Plug

Your journey begins not with a bang, but with a quiet letter. You'll need to navigate to the coordinates (405.5, 305.4) in the Crown Mines, the eastern part of Aesperia. The easiest way is to follow the path leading from the Miners' Camp. There, sitting on an unassuming crate like a forgotten secret, you'll find the 'Mysterious Letter'. Interacting with it is what ignites the entire 'Ark' quest chain. If the prompt to read it doesn't appear, don't panic—it likely means you've already triggered the quest elsewhere. Pro-tip: This initial step is as crucial as finding the ignition key for a dormant spaceship; without it, the whole adventure remains grounded.

Step 2: Eavesdrop on a Heartfelt Chat

Almost immediately after reading the letter, keep your ears open. Just to the left of the crate (if you're facing it from the same angle as the guide image), you'll spot a mother and daughter deep in conversation.

Approach and interact with them to eavesdrop. This brief interaction adds a sliver of world-building and seamlessly pushes you to the next objective. It's a quick and easy step, over before you know it.

Step 3: Wake the Sleeping Guard (Fred)

No need to travel far! Your next target, an NPC named Fred, is literally sleeping on the job. He's dozing on the porch right next to where you found the mysterious letter.

He might be harder to spot than the chatty duo, so use the image above for reference. A quick chat with Fred will point your compass toward a much more distinct landmark.

Step 4: Journey to the Lumina & Meet the Ghostly Miners

This is where your adventure gets a visual upgrade. You must now travel to a grounded ship called the Lumina. Its location is a blessing—it's actually marked on your world map! You can find it south of the Crown Omnium Tower and southeast of the Research Lab in District 4. The nearest teleport point is at coordinates (788.0, 670.4).

Once you arrive at the imposing, derelict ship, your goal is to find two spectral figures: Unknown Miner A and Unknown Miner B. They aren't on the main deck. Climb the ramp leading toward the ship's upper levels, then use a double-jump or your climbing skills to reach the level directly above. There, you'll find the two ghostly miners, waiting like echoes of a past tragedy.

Conversing with these phantom NPCs is like tuning into a faint radio signal from a lost expedition; their story provides crucial context before the quest's final act.

Step 5: The Final Report in Hykros

With the miners' tale heard, it's time to head home. Teleport to any unlocked Omnium Tower and use its terminal to travel back to the floating city of Hykros. This final step is as straightforward as filing a mission report. Seek out the NPC named Adacs. A conversation with him will formally conclude the 'Ark' quest line. If you've completed all other chapter requirements, this interaction should be the final keystone that completes your Chapter 4 progression, showering you with those well-earned rewards. 🎉

Quick Summary & Checklist:

Step	Location / NPC	Key Action
1	Crown Mines (405.5, 305.4)	Find & read the Mysterious Letter on a crate.
2	Near the letter	Eavesdrop on the Mother & Daughter.
3	Porch near the letter	Interact with the sleeping Fred.
4	The Lumina ship (788.0, 670.4)	Find and talk to Unknown Miner A & B on the upper level.
5	Hykros (via Omnium Tower)	Report to Adacs to complete the quest.

Why Bother? The Reward Breakdown:

Completing 'Ark' isn't just about ticking a box. It's the gateway to your Chapter 4 completion rewards, which are as essential for progression as fuel is for a Simulacrum. Think of these resources as the gears and cogs that keep your character's power engine running smoothly:

• Omnium Crystals: Vital level-up material for your weapons.

• Gold Nuclei: Pulls on the standard banner for more weapons and Simulacra.

• Dark Crystals: The premium currency for limited banners and special purchases.

Navigating this quest in 2025 remains a consistent part of the Aesperia experience. While the open world of Tower of Fantasy has expanded dramatically with new regions and stories, mastering these early hidden quests like 'Ark' is a fundamental skill. It teaches you to look beyond the obvious map markers and interact with the world's subtle details—a lesson as valuable as any legendary weapon. So gear up, head to those coordinates, and claim your rewards! Your fully completed chapter awaits.