Eureka Orthos
Eureka Orthos
- Level
- 81 (Sync: 90)
- Difficulty
- Normal
- Party size
- Flexible
1-4 man • 1-4
- Unsyncing
- Allowed
- Time limit
- 60 minutes
- Req. quest
Delve into Myth- Entrance
- Mor Dhona (X:34.8, Y:19.2)
- Patch
- 6.35
Eureka Orthos is a level 81 deep dungeon introduced in patch 6.35 with Endwalker.
All players will begin at level 81, and only by fighting the enemies within will they be able to gain the strength and experience needed to explore its depths.
Players who choose to leave and return later can continue playing from where they last saved.
- Eureka Orthos save data is separate to data used for other Deep Dungeons. Two save data slots are available for Eureka Orthos.
Requirements
Complete the quest Delve into Myth
- Disciple of War or Magic level 81
- Starting NPC: Koh Rabntah
- NPC Location: Mor Dhona
- Prerequisite: complete the main scenario quest
Endwalker and floor 50 of the 
Palace of the Dead.
Entering Eureka Orthos
Players can enter Eureka Orthos by speaking with Khatun in Mor Dhona (X:34.8 Y:19.2). When entering as a party, only the party leader can start the instance. It can also be entered with a cross-world party.
- All party members must be in the same Mor Dhona instance to enter Eureka Orthos.
Players who have cleared floor 30 of Eureka Orthos and the sidequest Rage Extinguished will be given the option to start from floor 1 or floor 21 when creating a new save file. When starting from floor 21, players will be set to level 90 and their inventories will be cleared of protomanders and demiclones.
=Character Growth
Players will start at level 81 regardless of their current class or job level. By defeating enemies that appear in the dungeon, players will be able to gain EXP and level their characters up to 90. Your Eureka Orthos level is not directly related to your level outside of the dungeon.
Orthos Aetherpool Gear
Players will be restricted to the use of an Orthos aetherpool arm and Orthos aetherpool armor when inside Eureka Orthos. In addition to gaining levels, players must enhance these items as they progress through the dungeon.
Note that Orthos aetherpool armor will take the appearance of your current gear upon entering the instance.
- Normal gear has no effect on your character's attributes inside Eureka Orthos.
- Aetherpool gear strength will not carry over from Palace of the Dead or Heaven-on-High.
Floor 31 and Beyond
While floors up to 30 are related to the story of Eureka Orthos, all floors after were created strictly as a challenge for players. For this reason, you cannot enter floors beyond 30 with a matched party. Furthermore, in addition to completing the sidequest "Rage Extinguished," players must meet the following requirements to challenge these floors:
- Start from floor 1 or floor 21 with a fixed party and clear up to floor 30.
- Party KO count must be zero.
Save data with one or more party KOs cannot be used on floor 31 or higher.
- Please be advised that the party KO count will also increase in the event your party abandons the duty or logs out while inside the instance.
Protomanders
Players will, on occasion, obtain protomanders from treasure chests within Eureka Orthos. These items have various uses ranging from displaying the entire map of your current floor, to providing party members with beneficial effects. Up to three of each protomander can be held at any time. These items can be found in a shared inventory to be used by all party members.
Some protomanders offer different effects from the pomanders found in the Palace of the Dead and Heaven-on-High.
Demiclones
Players will, on occasion, obtain tomestones from treasure coffers in Eureka Orthos, which can be used to generate demiclones. These items can be used by all party members once acquired.
Up to three tomestones can be held at once and are kept in a shared inventory. Tomestones cannot be taken outside of Eureka Orthos. When in a matched party, they cannot be used after the completion of a set of floors.
Demiclones will follow and fight alongside the player who generated them. Each demiclone has unique strengths, so choose carefully to turn the tides in your favor.
Floor Effects
Players may trigger the following floor effects:
- Status Effects - Some floors may inflict detrimental or beneficial statuses on players.
- Prohibited Magic or Special Actions - Some floors may prohibit certain actions.
- Floor Effect: Gloom - Some floors may have strengthened enemies.
Dread Beasts
Players may gain the strength of dread beasts that lurk within Eureka Orthos by defeating them.
The Accursed Hoard
While exploring Eureka Orthos, players will, on occasion, discover hidden treasure known as the Accursed Hoard. While a protomander of intuition is in effect, an icon on the navigation map will indicate the presence of a piece of the Accursed Hoard.
Upon saving progress and exiting Eureka Orthos, players can take this treasure to Valeroine in Mor Dhona (X:34.9 Y:19.1) to have it appraised and discover what lies within.
Rewards
Lore
“In the late Third Astral Era, when the ancient Allagan Empire was at the zenith of its glory, researchers toiled deep under the Crystal Tower to uncover secrets which might uplift their motherland to even greater heights. Their laboratory was dubbed Eureka Orthos, where impossible concepts of immortality, cloning, and dominion over the divine were made reality. So fantastic was this research that the legend of Eureka has endured through the ages─and it now falls to the star's foremost adventurer to bring the laboratory's buried secrets into the light of day.
— 6.3 special site description
