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FFXIV Endwalker Guide: The Lunar Subterrane

5 Oct 2023

Spoiler warning: This guide contains information from the FFXIV Endwalker Patch 6.5 Main Scenario!!!

The Lunar Subterrane is a Final Fantasy XIV: Endwalker dungeon. It’s available at level 90 as part of the quest Down in the Dark. It can be completed via the duty finder and is part of the Patch 6.5 Expert Duty Roulette.

Never be afraid to take a dungeon at your own pace, but for the purposes of this guide, we’re going to be speaking in terms of multiple group pulls.

Encounters 1 & 2

5 Voidmoon Panopt, 1 Voidmoon Plague, 2 Voidmoon Arch Demon, & 1 Voidmoon Dahak

  • Stare – A large linear AoE aimed at a random player, cast by the Plague.
  • The Look – A conal AoE aimed at a random player, cast by the Dahak.

Encounters 3 & 4

4 Voidmoon Panopt, 2 Voidmoon Archaeodemon, 2 Voidmoon Humbaba, & 1 Voidmoon Plague

  • Unholy Darkness – A circular AoE aimed at a random player, cast by the Archaeodemon.
  • Anoxic Breath – A small conal AoE aimed at a random player, cast by the Humbaba. Getting hit by this also causes the player to get knocked back.

Dark Elf

  • Hexing Staves – Two staves will appear on the battlefield and project cross-shaped AoEs along the lanes of the floor. Getting hit by a staff linear applies an esuna-able Doom.
  • Shadowy Sigil – A semi-random pattern of blue squares and pink triangles will show up in the grid on the floor. At the same time, one of the symbols will float around the boss. Avoid the floor tiles with that floating symbol.
  • Hexing Staves
  • Sorcerous Shroud – The boss will make the 2 staves invisible. You’ll have to remember where the safe spots are.
  • Void Dark II – Each player will be marked with a pink, traveling AoE circle. Spread out, but keep those safe spots from the Hexing Staves in mind.
  • Ruinous Confluence – Move back to the safe spots before this cast finishes.
  • Hexing Staves* – Three staves will show up this time, blocking out all floor tiles except one.
  • Sorcerous Shroud – All 3 staves will go invisible. Remember your singular safe spot.
  • Void Dark II – You’ll have to deal with this along side:
  • Shadowy Sigil – Spread out amongst the safe sigils.
  • Ruinous Confluence – Move back to the safe spot before this cast finishes.
  • Staff Smite – A tank buster.
  • Abyssal Outburst – Unavoidable, arena-wide damage.
  • Abyssal Outburst
  • *Repeats from Hexing Staves until defeat.

Encounters 5 & 6

5 Frenzied Goblin, 1 Frenzied Morbol, 3 Frenzied Cockerel & 1 Memoriate of Darkness

  • Bad Breath – A conal AoE aimed at a random player by the Morbol. Applies every debuff known to man.

Encounters 7 & 8

2 Frenzied Peiste, 1 Frenzied Manticore, 3 Frenzied Goblin & 1 Frenzied Behemoth

  • Heat Breath – A conal AoE aimed at a random player by the Manticore.
  • Trounce – A giant conal AoE aimed at a random player by the Behemoth.

Damcyan Antlion

  • Sandblast – Unavoidable, arena-wide damage.
  • Landslip – Four lanes appear on the floor, each of them eventually pushing players standing on them in the indicated direction. Players will slide about the length of 3 of the pillars on the side of the arena. This is important information for later.
  • Antlion March* – The Antlion will do 5 dashes, hitting 2 of the pillars on the sides in the process. The pillars that are going to be hit will have exclamation points on them beforehand, and cracks toward their bases where the words “Lv?? Stone Pillar” used to be after the strikes from the Antlion dashes. These pillars will fall during the next mechanic:
  • Landslip – As before, the lanes will push players in the direction of their arrow indicators. Position yourself so that the Landslip movement shifts you 3 columns down into a row where a column isn’t falling.
  • Earthen Geyser – A stack mechanic that turns into a quicksand pit after it hits. Move quickly to the edge to avoid intsa-death by sinking into the pit.
  • Pound Sand – One player will be marked with a huge AoE circle as everyone moves to get out of the quicksand. This seems to be the player who’s made it the farthest out of the pit. Even if you’re headed directly for the AoE on your way out of the quicksand, you’ll have time to adjust and escape the circle.
  • Sandblast
  • *Repeats from Antlion March until defeat.

Encounters 9, 10 & 11

4 Armor of Baron, 1 Original Hellhound, 2 Baron Jester, & 1 Memoriate of Darkness

  • Ravenous Bite – A charged tank buster executed by the Hellhound.
  • Black Wind – A circular AoE cast by the Jester.

Encounters 12 & 13

1 Original Gargoyle, 2 Dark Grenade, 1 Original Prognitrix, 2 Original Blackguard, 2 Vampiress & 1 Memoriate of Darkness

  • Grim Fate – A conal AoE from the Gargoyle.
  • Scalding Scolding – A conal AoE cast by the Prognitrix.
  • Void Fire IV – A circular AoE cast on a random player by the Vampiress.


  • Old Magic – Unavoidable, arena-wide damage.
  • Duplicitous Battery – A spiral of circular AoEs progresses outward from near the center of the arena, then disappears. Remember those positions. A second spiral then forms in the safe gaps of the first spiral. Stand in the AoE circles of the second spiral and move into the safe spaces left after the first, now invisible spiral explodes.
  • Forsaken Fount – Four balls of darkness will appear across the centerline of the arena and eventually explode in somewhat sizeable AoEs circles.
  • Duplicitous Battery – From here on out, this mechanic will include traveling, pink AoEs being applied to each player, so you’ll need to spread out more while handling the spiral shuffle.
  • Forsaken Fount – Three balls this time.
  • Contrapasso – The boss slices the dark energy balls in half and each half floats a set distance away in the direction that the arrows on either side of the ball indicate. Each ball half will explode in a full circular AoE after it reaches its destination.
  • Forsaken Fount (v1)* – Five balls this time in a more spread out pattern.
  • Contrapasso – You’ll need to observe the arrows on each of the balls to find the safe gap. They’ll all move the same, set distance away and not all the way to the walls. This first one has an an eventual safe gap under the ball that spawns farthest from the rest.
  • Old Magic
  • Antipodal Assault – A linear stack mechanic that sends Durante charging to the edge of the arena.
  • Hard Slash – From his new position at the edge, the boss will turn and do a huge conal AoE across the floor, leaving only 2 small gaps of safety to stand in near the wall.
  • Twilight Phase – The boss will call up 2 rows of spikes in front of and behind him. At the end of the cast, they’ll shoot off in those directions in 2 wide, linear AoEs.
  • Dark Impact – Durante will turn perpendicular from his previous attack and tether a huge ball of dark aether to the ground. Start moving to the opposite side of the arena from the tether point, as when the ball hits the ground, it will explode in a huge, circular AoE.
  • Death’s Journey* – The ground will look as if it’s divided into 8 pizza slices with a circular AoE in the center. In actuality, 8, conal AoEs will travel along the purple lines projected on the ground, so center yourself in one of the slices.
  • Forsaken Fount (v2) – There are again 5 balls, but in a different, more even pattern, like the dots on the 5 side of a 6-sided die.
  • Contrapasso – The arrows that show up on the balls are much less even, but notice that all the balls on the outside have their halves travelling along the circumference of the circle, while the center ball splits cleanly to 2 sides. This leaves the safe spot in the middle.
  • Old Magic
  • Duplicitous Battery
  • Antipodal Assault
  • Hard Slash
  • Twilight Phase
  • Dark Impact
  • Arcane Edge – A tank buster.
  • Death’s Journey
  • Forsaken Fount (v1)
  • Contrapasso
  • Old Magic
  • Duplicitous Battery
  • Antipodal Assault
  • Hard Slash
  • Twilight Phase
  • Dark Impact
  • Arcane Edge
  • *Repeats from Death’s Journey until defeat.

Congratulations, you’ve completed The Lunar Subterrane!