Hidden beneath the streets of Mor Dhona lies Eureka Orthos, a challenge reserved for those brave enough to face its shifting floors and unseen dangers. Here’s how to gain access to this mysterious deep dungeon and begin your ascent into its ever-twisting depths.
Deep dungeons are roguelite multi-floor instances that have their own leveling system and items. Defeat the enemies inside to level up and progress to the next floor, and open chests to receive items and upgrade your gear. You can enter the dungeon solo or with up to four people in a party, and you have two save slots to keep your progression.
Continue on to find out where to unlock Eureka Orthos and to learn the differences between it and Heaven-on-High and Palace of the Dead.
How to unlock Eureka Orthos in FFXIV
Complete the Endwalker main scenario quest. Clear floor 50 of Palace of the Dead with a Disciple of War or Magic job at level 81 or higher. Speak to Koh Rabntah at Mor Dhona (X:21.8 Y:8.1) to pick up the quest Delve into Myth, then talk to Khatun nearby to enter Eureka Orthos.
In order to unlock Eureka Orthos, you need to meet the following prerequisites:
- Complete the main scenario quest “Endwalker.”
- Complete floor 50 of the Palace of the Dead.
- Have at least one Disciple of War or Magic (excluding limited jobs) at level 81
Once you have those, talk to Koh Rabntahin Mor Dhona to start the quest “Delve into Myth.” If you’re having trouble locating them, check out the image below.
How to enter Eureka Orthos in FFXIV
To enter Eureka Orthos, complete the final encounter in the Eureka Anemos, then speak with a specific NPC to request entry; you’ll need an Adept’s Guide or better and be at least Level 60 with your Eureka entry privilege active, after which you can teleport to the instance and begin the deep dungeon.
After completing “Delve into Myth,” speak to Khatun in Mor Dhona to enter Eureka Orthos. If you don’t want to travel all the way to Khatun, you can talk to Burnelin Mor Dhona to teleport to the entrance. If you’re having trouble finding either of them, check out the image gallery below to see their locations.
Players will first start at floor one, but you can start at floor 21 if you’ve met the following prerequisites:
- Clear floor 30 of Eureka Orthos.
- Complete the quest “Rage Extinguished.”
How to unlock the quest ‘Rage Extinguished’ in FFXIV
Clear floor 30 of Eureka Orthos. Then speak to Koh Rabntah at Mor Dhona (X:34.7 Y:19.3) to accept the quest. Completion requires prior access to the dungeon via “Delve into Myth.” This opens the option to enter from floor 21 on future runs.
In order to unlock the quest “Rage Extinguished,” you must first clear floor 30 of Eureka Orthos. Afterward, speak to Koh Rabntah in Mor Dhona to start the quest.
Differences between Eureka Orthos and the other deep dungeons
Eureka Orthos stands apart from Palace of the Dead and Heaven-on-High through its focus on mechanics-heavy bosses with late or untelegraphed AoE attacks that deal lethal damage past floor 30, rather than high auto-attack threats from prior dungeons. Enemies inflict minimal unavoidable damage, shifting emphasis to precise dodging over raw survivability in job choice. It introduces demiclones from tomestones as summonable NPC allies in place of magicites, dread beasts as elite foes, protomanders instead of pomanders, and pillars over cairns, alongside separate save slots and a level 81 start.
The major differences between Eureka Orthos and the other deep dungeons are the dread beasts and demiclones. Smaller changes include the name change from a few name changes from pomanders to protomanders, cairns to pillars, and few different protomanders.
Dread Beasts
Dread beasts are much stronger than the average monster inside Eureka Orthos, but once you defeat one, you’ll receive a buff. Dread beasts can be easily spotted by the glow around them, so keep an eye out for any enemies that have an active animation surrounding them.
Be very careful around dread beasts because they will one shot you in one auto attack. Make sure you have the right protomanders and a high aetherpool level to take one on.
Demiclones
Demiclones take over for Magicites from Heaven-on-High in Eureka Orthos, but they don’t function the same as Magicites. Demiclones will not wipe out the floor, but instead will summon a demiclone to fight alongside you. Each demiclone has their own set of abilities that caters to each of the three roles: DPS, healer, and tank. There is a chance to obtain Demiclones by opening Silver Coffers inside of Eureka Orthos.
Eureka Orthos Rewards
Eureka Orthos Rewards include a range of exclusive items that make the climb through the deep dungeon worthwhile. Players can earn unique weapons and gear with distinctive glowing designs, as well as minions, mounts, and glamour items. Progressing through higher floors increases the chances of obtaining rarer drops, while special tokens gained within the dungeon can be exchanged for valuable rewards from specific vendors in Mor Dhona.
Once completing an instance of Eureka Orthos, you’ll receive rewards depending on your level and progress.
If you’re level 90 when you enter, you’ll receive Allagan tomestones and gil based on the floors completed. For more detailed information, check out the table below.
Level 90 rewards for Eureka Orthos in FFXIV
Reaching level 90 in Eureka Orthos grants players gil, Allagan tomestones of poetics, and additional capped tomestones like astronomy and causality, scaled by floor progress. Floor 10 yields 10 poetics, 1000 gil, plus 20 astronomy and 5 causality tomestones for level 90 jobs. Floor 20 provides 20 poetics, 1500 gil, 40 astronomy, and 10 causality; Floor 30 or higher offers 30 poetics, 2000 gil, 60 astronomy, and 10 causality.
Floor |
Reward |
|---|---|
| Floor 10 | 10 Allagan tomestones of poetics, 20 Allagan tomestones of astronomy, 5 Allagan tomestones of casuality, 1,000 gil |
| Floor 20 | 20 Allagan tomestones of poetics, 40 Allagan tomestones of astronomy, 10 Allagan tomestones of casuality, 1,500 gil |
| Floor 30 and up | 30 Allagan tomestones of poetics, 60 Allagan tomestones of astronomy, 10 Allagan tomestones of causality, 2,000 gil |
If you’re between levels 81 and 90 when you enter, you’ll receive experience points, gil, and Allagan tomestones of poetics based on the floors completed. For more detailed information, check out the table below.
Between level 81 – 90 rewards for Eureka Orthos in FFXIV
Between floors 81 and 90, players in Eureka Orthos gain access to some of the most distinctive rewards of the deep dungeon. These include high-tier aetherpool weapon and armor upgrades, special Orthos-themed cosmetic items, and rare materials used for crafting unique gear. Players may also earn titles and achievements specific to completing this range of floors, rewarding both skill and persistence as the enemies grow far stronger and the layout demands greater tactical awareness.
Floor |
Reward |
|---|---|
| Floor 10 | 10 Allagan tomestones of poetics, Experience, 1,000 gil |
| Floor 20 | 20 Allagan tomestones of poetics, Experience, 1,500 gil |
| Floor 30 and up | 30 Allagan tomestones of poetics, Experience, 2,000 gil |
If you’ve completed the floors above 30, you’ll receive an Orthos aetherpool fragment that can be traded in to the synthesis node in Mor Dhona.
For a full list of the rewards you can get with Orthos aetherpool fragments, check the table below.
Orthos Aetherpool Fragment Rewards
Orthos Aetherpool Fragment Rewards grant gear upgrades for characters between levels 80 and 90. Players collect these fragments from floor chests and boss drops inside the Orthos deep dungeon. Accumulate enough to trade with the Expedition Lockbox in Port Surgate for weapons and armor with high item levels. Higher floors yield rarer fragments, enabling access to progressively stronger equipment sets.
Item |
Orthos Aetherpool Fragment Cost |
|---|---|
| Orthos Potion | 1 |
| Savage Aim Materia IX | 3 |
| Savage Might Materia IX | 3 |
| Heavens’ Eye Materia IX | 3 |
| Quickarm Materia IX | 3 |
| Quicktongue Materia IX | 3 |
| Battledance Materia IX | 3 |
| Piety Materia IX | 3 |
| Savage Aim Materia X | 6 |
| Savage Might Materia X | 6 |
| Heavens’ Eye Materia X | 6 |
| Quickarm Materia X | 6 |
| Quicktongue Materia X | 6 |
| Battledance Materia X | 6 |
| Piety Materia X | 6 |
Orthos Aetherpool Gear
Similar to the other deep dungeons, you can keep your aetherpool gear by exchanging Orthos aetherpool grips. If you’ve strengthened your Orthos aetherpool arm and armor to 10, and you’ve completed the sidequest “Rage Extinguished,” you can synthesize an Orthos aetherpool grip which will reduce the strength of your aetherpool arm and armor by 10.
Eureka Orthos beginner tips and mechanics
Eureka Orthos is a solo-friendly deep dungeon in FFXIV with 100 floors of randomized mobs, bosses, and heavy emphasis on mechanics over raw damage. Beginners should prioritize learning enemy telegraphs, using Aetherpool consumables wisely, and managing pulls carefully.
Core Mechanics
Enemies use one-shot abilities (often their 1st or 2nd skill), so dodge AoEs, tethers, and telegraphed attacks-many aggro by sight (avoid cones), sound (walk to bypass), or proximity (kill first).
Floors have debuff sets (check at start); bad ones like heavy damage taken or reduced heals need buffs like Serenity or Demi-clone.
Progress saves in two slots; magic pots restore HP/MP fully but are limited.
Beginner Consumable Tips
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Protomander of Lethargy (floors 1, 4, 7+ for new mobs): Slows enemy casts to learn mechanics safely.
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Raising/Flights: Use early for risky sets; save for 71+ “hard sets.”
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Strength/Serenity: Boost damage/healing at pull starts; keep at 2 stacks for pacing.
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Demi-clone/Steel: For bosses-clone tanks adds, Steel survives mistakes. Fish silver chests for clones.
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Prioritize patrols > proximity > dangerous mobs (e.g., Orthonites’ pull+AoE).
Pull and Survival Strategies
Pull small groups first, use LoS (line-of-sight) to dodge uninterruptible casts like Quake.
Kite threats like Ahriman or Kelpie (Gallop tether then puddle); walk to avoid sound aggro.
Solo tip: Any familiar DPS job works-focus mechanics over rotation; use pots liberally early on.
Best jobs for soloing Eureka Orthos
Any DPS job you master works well for soloing Eureka Orthos, as mechanics matter more than raw power-focus on ones you can play without checking hotbars. Top picks like Red Mage, Machinist, Samurai, Summoner, and Reaper shine due to strong burst, survival tools, and castbar flexibility.
Recommended DPS Jobs
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Red Mage (RDM): Vercure heals itemless floors, Sleep CCs adds, spells dodge silences/reflects; gap-closers aid evasion.
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Machinist (MCH): High burst without alignment, easy kiting, popular for PotD carryover; handles debuffs well.
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Samurai (SAM): Massive burst kills threats fast, consistent even in unlucky RNG; less reliant on CDs.
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Summoner (SMN): Bahamut bursts tough mobs, instant casts ignore some debuffs; strong for early clears.
Job Tier Insights
Tanks and healers (e.g., AST, SCH) lag due to lower DPS and time pressure, though viable with skill. BRD/DNC rank lower from weaker survival. Play your best job-clear rates show minimal gaps among top DPS.
| Job Type | Strengths | Weaknesses |
|---|---|---|
| Melee DPS (SAM, RPR) | Burst, mobility | Vulnerable to heavy debuffs |
| Ranged/Casters (MCH, RDM, SMN) | Sustained damage, utility | Castbar interruptions |
| Healers/Tanks | Survival | Slow kills |
