Myth optional boss location An Automaton's Journey: Complete Unlock Guide

To find the exact Myth optional boss location An Automaton's Journey players must navigate to the hidden Chronosphere Observatory, located behind a bombable wall in the western wing of the Sands of Time dungeon. You cannot simply walk into this arena; the heavy blast door requires five distinct Mythic Relics scattered across the overworld. Because this encounter scales heavily to your endgame stats, attempting it before securing all 16 heart upgrades and the Level 3 Liz's Sword is a guaranteed death. Here is the definitive route to assemble the relics, breach the Observatory, and survive the most punishing endurance fight in the entire holo Indie catalog.

01

Where to Find the Chronosphere Observatorytag

The Sands of Time dungeon is accessible only after clearing the third chapter of the main campaign, but the Observatory itself is sealed off until the late game. Fast-travel to the main entrance of the Sands of Time. From the central hub room, take the western door. You will enter a long corridor filled with shifting sand pits that drag Cecilia downward.

Equip Fuwamoco's Claws to sprint across the pits without sinking. Two rooms to the left, you will find a dead-end chamber with four unlit torches and a suspicious crack on the northern wall. Light the torches using the Fire Rod to stop the infinite spawn of sand-slime enemies, giving you room to breathe. Place a standard bomb directly against the cracked masonry. The explosion reveals a hidden antechamber containing five empty pedestals surrounding a central elevator. This is the entrance to the Chronosphere Observatory. The elevator will not activate until all five pedestals are filled with the corresponding Mythic Relics.

02

How to Gather the 5 Mythic Relicstag

Before returning to the Sands of Time, Cecilia must scour the map for the five Mementos representing the Myth faction. Each relic is locked behind traversal puzzles that require late-game dungeon items.

The Rusted Scythe (Underworld Crypt)tag

Travel to the Underworld Crypt located in the southern swamps. Proceed to the third floor down (B3). The central room features a massive lava pit that cannot be crossed with standard jumps. Equip Gigi's Tail—the game's equivalent of a hookshot—and grapple to the floating wooden stakes. The chest on the far platform contains The Rusted Scythe.

The Phoenix Feather (Holo-Volcano)tag

Scale the Holo-Volcano up to the summit save point. To the right of the save statue is a pathway blocked by constant, heavy ash-fall that drains Cecilia's health by one heart per second. Activate the Moai Transformation. The stone form makes you immune to environmental hazard damage. Walk slowly through the ash storm to reach a hidden shrine containing The Phoenix Feather.

The Ancient Tome (Sunken Library)tag

The Sunken Library is an optional mini-dungeon off the coast of the main continent. Inside the final room, you will find a puzzle involving three colored blocks (Red, Blue, Purple) and a central pedestal. You must push the blocks into the slots matching their colors. However, the blocks are too heavy to move by hand. Equip Liz's Sword and use the charged spin attack to knock the blocks into place. The pedestal will open, yielding The Ancient Tome.

The Trident Shard (Coral Reef)tag

Head to the Coral Reef dungeon. You cannot reach the bottom floor until you complete the Justice faction side-quest line and obtain the Zora-style diving scale from Elizabeth Rose Bloodflame. Once equipped, dive into the whirlpool in the center of the reef. The current will drag you into a hidden cavern where The Trident Shard rests on a clam-shell altar.

The Pocket Watch (Clockwork Ruins)tag

The Clockwork Ruins are Cecilia's starting area, but the eastern wing remains locked until you acquire Fuwamoco's Claws. Return to the ruins and unlock the eastern door. You will face a hallway lined with crushing stone pillars that slam down every two seconds. Activate the sprint function of the Claws to dash through the gauntlet perfectly. The chest at the end holds The Pocket Watch.

03

Optimal Loadout and Preparationtag

Do not walk into the Chronosphere Observatory under-geared. The damage scaling on the Myth boss attacks will one-shot Cecilia if you have fewer than 16 hearts.

• Primary Weapon: Liz's Sword (Level 3). The base sword lacks the raw DPS needed for the Phase 3 DPS check. Upgrade it at the HoloSmith in the main hub town using 15 Iron Ores and 5 Gold Ingots.
• Movement: Fuwamoco's Claws. Mandatory for dodging the shockwave attacks in Phase 1. The default dodge roll does not cover enough distance.
• Defensive Skill: Moai Transformation. The invincibility frames (i-frames) generated during the transformation animation are the only reliable way to survive the screen-wipe attacks in Phase 2.
• Consumables: Bring exactly four Full Repair Kits. Do not waste inventory space on minor healing oils; the burst damage in this fight requires full heals.

04

The Myth Boss Fight: Phase-by-Phase Breakdowntag

Placing the five relics on the pedestals triggers the elevator, dropping Cecilia into a massive, circular arena. The Myth encounter is a grueling three-phase endurance check. The five members do not fight you one-on-one; they tag in and out, layering their area-of-effect (AoE) attacks to trap you.

Phase 1 - The Time Detective & The Sharktag

The fight opens against Amelia and Gura. Amelia stays on the perimeter, spamming ground-pounds that send out three concentric shockwaves. Simultaneously, Gura dives into the floor and summons tracking water vortexes that slow Cecilia's movement speed by 50% if touched.

Strategy: Keep moving in a circular pattern. Use Fuwamoco's Claws to maintain distance from the vortexes. Wait for Amelia to perform her leaping dive attack. When she lands, she is stuck in an animation lock for three seconds. Punish her with a charged attack from Liz's Sword. Depleting Amelia's health bar forces both characters to retreat.

Phase 2 - Death & The Phoenixtag

Calli and Kiara tag in, and the arena shrinks. Calli acts as the primary aggressor, swinging her scythe in massive arcs that cover 60% of the screen. Kiara floats in the background as a support caster, dropping fireballs and attempting to heal Calli.

Strategy: You must burst Kiara down first. If Kiara completes her 5-second "Phoenix Down" chant, Calli recovers 2,000 HP, effectively resetting the phase. Ignore Calli and chase Kiara. When Calli winds up for her "Reaper's Harvest" screen-wipe attack, trigger the Moai Transformation to tank the hit with i-frames, then immediately resume hitting Kiara. Once Kiara falls, Calli becomes enraged but her attack patterns become predictable three-hit combos that can be easily dodged.

Phase 3 - The Priestess of the Voidtag

With the first four members defeated, Ina'nis floats into the center of the room, absorbs the remaining energy, and transforms the arena into the Void. A 90-second timer appears at the top of the screen. This is a pure DPS check.

Strategy: Ina'nis summons eight massive tentacles that track your movement. The center of the room becomes a continuous blast zone. Spam Gigi's Tail to grapple to the four outer pillars to avoid the tentacles. You only have a two-second window to attack Ina'nis when her shield drops after a tentacle slam. Use every remaining Full Repair Kit to tank the minor damage and focus entirely on landing Level 3 sword strikes. If the 90 seconds expire, the screen goes entirely black, resulting in an instant wipe.

05

Comparing Myth to the Justice Faction Bossestag

Players coming fresh off the Justice faction campaign fights will find the Myth encounter jarring. The Justice members fight you individually, allowing you to learn their specific telegraphs and punish windows. Elizabeth Rose Bloodflame, for example, has a clear parry window on her thrust attacks.

The Myth boss fight strips away parry windows entirely. Because the bosses attack in duos, their AoE attacks overlap, forcing you to prioritize positioning over aggression. The raw health pool of the combined Myth members is roughly 15,000 HP, compared to the 4,500 HP of the final Justice boss. It is less a test of reflexes and more a test of resource management and loadout optimization.

06

Rewards: The Mythic Gear and Achievementtag

Surviving the 90-second DPS check and defeating Ina'nis triggers a unique cutscene and returns Cecilia to the Sands of Time antechamber. A golden chest will spawn containing the Mythic Gear.

This accessory is the most powerful item in An Automaton's Journey. When equipped, it reduces all incoming damage by 50% and permanently changes Cecilia's standard dodge roll into a teleport, allowing you to pass through enemies and thin walls. Additionally, defeating the boss unlocks the "Myths & Machines" Steam achievement. Because this achievement is hidden, many players miss it, but it is strictly required to earn the 100% completion profile badge on your save file.

07

Frequently Asked Questionstag

Can you fight the Myth boss before finishing the main story? Yes, the Chronosphere Observatory can be unlocked as soon as you have the required traversal items (Gigi's Tail, Fuwamoco's Claws, Moai Transformation, Zora Scale). However, because of the brutal damage scaling, it is highly recommended to treat this as a post-game activity.

What happens if I die during Phase 3? If Cecilia's health drops to zero, or if you fail the 90-second timer against Ina'nis, you will respawn at the save statue in the Observatory antechamber. Unfortunately, there are no checkpoints between phases. You must restart the entire fight from Phase 1 against Amelia and Gura.

Do I need to complete the HoloSmith upgrades to win? While technically possible to beat the boss with a Level 2 sword, the Phase 3 DPS check is mathematically balanced around the damage output of the Level 3 Liz's Sword. Attempting it with weaker weapons requires frame-perfect attacks and zero mistakes.