Costlemark Tower is an optional dungeon in Final Fantasy XV located in the Fallgrove in southern Lucis. The player must defeat the boss at its end to acquire a royal arm. Entry into the dungeon is required to complete Dino's final sidequest, A Treasure Beyond Measure.

The dungeon's entrance is magically sealed and will only open at night.

Costlemark Tower is a labyrinth of underground ruins. Although remains of large structures remain above-ground, they are all but gone in present day, and what is left is the underground portion. Costlemark was once part of the ancient civilization of Solheim, but now lies in ruin along with its arcane technology.

Warp-striking at the area with the moving blocks can be glitchy. If the player clips through a wall and there is no platform beneath them, they will fall into the abyss before being teleported outside the dungeon entrance.


Retrieving the royal armEdit


Noctis obtains the Sword of the Tall.

Costlemark Tower is populated with powerful enemies and the quests associated with the location recommend that the party be at least Level 55. The dungeon is structured as a mostly linear descent into the underground. As the party approaches the end there is a large chamber dotted with floor panels. Each panel leads to a gauntlet of enemies situated in a randomized maze which will either lead to the end of the dungeon, or a large room underneath the previous chamber where the player will have to fight a Red Giant reinforced by many Flans; each subsequent visit to this room increases the difficulty of the fight, culminating in three Red Giants and a Nagarani.

Once the correct path is taken, an elevator takes the party to the end of the dungeon, where they fight the Jabberwock that, upon its defeat, will drop the Sword of the Tall.

A Treasure Beyond MeasureEdit

Dino sends the party to acquire ore at Costlemark Tower as his final request. The quest becomes available after completing "No Gain, No Gem". Dino asks for an Emerald Stone which is found deep at Costlemark Tower. Completing the quest yields 3,000 EXP and an Emerald Bracelet.

A Menace Sleeps In CostlemarkEdit

This optional sidequest, with a recommended level of 99, is one of eight quests given to the party by Ezma in Chapter 15. To start the quest one must complete the main game and collect the Royal Arms from the following dungeons: Costlemark Tower, Crestholm Channels, Balouve Mines, and the Daurell Caverns.

When the prerequisites are met, the sidequest will appear at the Meldacio Hunter HQ southeast of the Vesperpool. Once the party speaks with Ezma, she will hand over the Sealbreaker's Key which will grant access to the mysterious large doors found in the lowest sections of the dungeons and begin the overarching quest Menace Beneath Lucis. To begin the quest A Menace Sleeps in Costlemark, the party must enter Costlemark Tower and return to its lowest level, where a sealed door awaits.

FFXV Costlemark Tower Sealed Door

The sealed door located in the base of Costlemark Tower.

Upon entering the sealed door, the party's map and the item menu will both become inactive for as long as they're inside. Similar to the other sealed dungeons, the party will follow a linear path battling room after room of progressively stronger foes with a reward present in the center of each chamber. Battles within the sealed door cannot be fled.

In the final room, a treasure awaits in its center. As Noctis approaches the item, the Bilröst will attack. After defeating the boss, the quest will end and Noctis will be able to collect the Dark Matter Bracelet.


Costlemark's Menace Dungeon is the second longest dungeon and easily the hardest. No items can be used once through the sealed door, and thus if Noctis's health falls to 0 and the party can't help him out of danger, the player will have to start again from the last haven.

The party should be level 90+ before attempting, and could benefit from a more defensive build. The accessories Magitek Suit V2, Black Hood and Anklet of the Gods are good choices. The Grand Chamberlain for Ignis can be useful also but isn't reliable. Most enemies in the dungeon are weak to daggers and greatswords, but the "boss" enemies are weak to swords, so the Zwill Crossblades are a must-have, and either the Ultima Blade or Balmung can help when parrying.

Some other precautions can be taken before entering:

List of floorsEdit

14 x Havocfang Lv 79Rusted Bit
22 x Hobgoblin Lv 74Debased Silverpiece
32 x Mindflayer Lv 86Mythril Shaft
43 x Hobgoblin Lv 74Megalixir
54 x Hobgoblin Lv 74Debased Coin
62 x Mindflayer Lv 86Chrome Bit
74 x Havocfang Lv 79Sky Gemstone
83 x Mindflayer Lv 86Oracle Ascension Coin
94 x Hobgoblin Lv 74Hi-Potion
10Dalperry HavenMegalixir
114 x Goblin Lv 84Potion
122 x Mindflayer Lv 86Megalixir
Left: Rusted Bit
Right: Magitek Core
132 x Mindflayer Lv 86Hi-Potion
144 x Hobgoblin Lv 88Oracle Ascension Coin
155 x Goblin Lv 84Debased Coin
165 x Goblin Lv 84Elixir
174 x Hobgoblin Lv 88Mega-Potion
183 x Hobgoblin Lv 88Onion Bangle
192 x Mindflayer Lv 86Ether
20Kerwicke HavenMegalixir
214 x Hobgoblin Lv 88Potion
221 x Malboro Lv 76Blue Diamond Bracelet
234 x Hobgoblin Lv 88Mythril Shaft
242 x Malboro Lv 76Elixir
252 x Hobgoblin Lv 88Debased Silverpiece
266 x Hobgoblin Lv 88Hi-Elixir
Left: Hi-Potion
Middle: Hypno Crown
273 x Hobgoblin Lv 88Sky Gemstone
281 x Jormungand Lv 95Soul of Thamasa
292 x Hobgoblin Lv 88Hi-Elixir
30Aechre HavenMegalixir
312 x Braindrainer Lv 95Chrome Bit
322 x Iron Giant Lv 90Mythril Shaft
332 x Braindrainer Lv 95Debased Banknote
344 x Iron Giant Lv 90Megalixir
354 x Goblin Lv 84Mega Phoenix
364 x Braindrainer Lv 95Sky Gemstone
Middle: Mega-Potion
Right: Oracle Ascension Coin
376 x Goblin Lv 84Hi-Potion
388 x Goblin Lv 84Applied Sorcery
392 x Braindrainer Lv 95Rare Coin
40Ingwen HavenPlatinum Ingot
415 x Goblin Lv 84Chrome Bit
422 x Uttu Lv 97Mythril Shaft
Left: Ether
Right: Megalixir
431 x Elder Coeurl Lv 95Debased Silverpiece
442 x Uttu Lv 97Oracle Ascension Coin
452 x Uttu Lv 97Rare Coin
468 x Goblin Lv 84Mega-Potion
476 x Goblin Lv 84Hi-Elixir
482 x Elder Coeurl Lv 95Celestriad
494 x Goblin Lv 84Ether
50Encefaln HavenMythril Ingot
512 x Uttu Lv 97Debased Silverpiece
524 x Goblin Lv 84Oracle Ascension Coin
534 x Goblin Lv 84Debased Banknote
542 x Uttu Lv 97Tarot Card
552 x Goblin Lv 84Sky Gemstone
562 x Serpentess Lv 95Oracle Ascension Coin
574 x Goblin Lv 84Mega Phoenix
582 x Serpentess Lv 95Elixir
592 x Uttu Lv 97Mega Phoenix
601 x Bilrost Lv 99Dark Matter Bracelet