Costlemark Tower is a dungeon in Final Fantasy XV. It is a part of the Treasure beyond measure quest given to you by Dino, and it can be difficult to beat. The first problem you’ll encounter is how to enter Costlemark Tower. Once you’re in, you’ll probably need help finding the Emerald stone location or discovering how to defeat Jabberwock boss that is located in the innermost sanctum. In this guide, we’re going to show you a FFXV Costlemark Tower dungeon walkthrough, to help you clear the instance.
How to enter Costlemark TowerEntering Costlemark Tower is only possible at night. Go to the location on the map after 8 PM and the dungeon doors will be open. Check out the map below to see the location of the dungeon. Make sure you are well-prepared for this quest, because it is full of dangerous creatures, and will spawn swarms of enemies at some moments.
Costlemark Tower walkthroughGo down the stairs, pass the first empty room, and prepare for the fight in the second room with level 54 Galvanades. They will attack you with lightning damage, so watch out for Thunder bombs, and if you have some lightning resistant gear, be sure to equip it. Also, level 35 Gelatins will be there, but they should not be as much of a trouble for you as the Galvanades. This fight will set the tone for the rest of the dungeon, so if you feel that this fight was too hard, maybe you should head back to the dungeon entrance and come back later when you level up some more.
In the next room, you will have to fight several level 39 Ereshkigal. When you clear the room, go right and across the narrow ledge to obtain Thieves Way II. It is an item that only Noctis can wear and it greatly reduces MP cost when phasing. Continue across the fallen pillar and head to the room with the circular staircase. Watch out for the level 44 Busemands. On the left side, you will find Orichalcum daggers, which are infused with holy light that deal a great amount of damage and serve best against the daemons. Head down the stairs, and follow the path.After the stairs, go straight and you will find another spiral staircase and at the bottom there is a source of fire magic. Go through the big open doors and proceed through the small passage, and you will enter the second part of the dungeon. Make sure to pick up the Emerald stone needed for the Treasure beyond measure quest.In the room on the right, you will find the Durandal Sword. Go to the left side of the dungeon, and head straight. You will find the Oracle Ascension Coin at the end of the path. Turn left and head onward to the lower part of the dungeon. Along the way you will see two golden doors. Behind the first is a Mega-Potion and behind the second golden doors is the Platinum Bangle that considerably increases maximum HP. Also, you will find the sources of ice and lightning magic, so make sure you drain them.You will find yourself in the long hallway, full of dangerous Galvanades and Ereshkigals. Continue down the circular path and you will come across a bridge that is guarded by the Yojimbo ronin. Pick up the Mega Phoenix once you defeat him, and head down the path. You will enter a room that is filled with square-shaped signs on the floor.
NOTE: Always check the minimap, because it will show you the way you should go in the labyrinths to come.
The red switches will send you back to the entrance – avoid them. The floor panels are actually elevators – three are traps, one will take you further. The traps will lower you into a room with a bunch of monsters. Each visit will spawn more and more of them, and the game won’t let you leave until you’ve killed them all.
As far as we know, the panels are randomized, so the right one for you could be different than it was for us. For us, the one in the southwest was the one that led us forward. The best advice we can give you is to memorize which ones you’ve already tested and not step on them again. You’ll need to step on the wrong ones a couple of times first, before the game unlocks the correct path.
You’ll know you’re on the right path when you don’t end up in the large room again. Keep going towards the east. You might need to make detours, but always keep going east. When you get to a place where you can choose between two paths, take the one leading east (there’s a round carving on the floor in front of the cube you should push). The one to the south will lead you back into the elevator room – stay away from it.
Jabberwock boss fightJabberwock is a giant dragon-like creature and he is the last monster that you need to kill in order to finish Costlemark Tower. He is a level 58 boss, but since you’ve come this far, try to endure this battle as well. The good thing about him is that he doesn’t spawn more minions with him, and you can focus only on him in order to finish the dungeon. He is very large, but so is the arena where you will fight him, so you can have some time for a breather when you move away from him.His attacks have a long range, so make sure to not rush into him. Instead, try and to approach him from behind. At the end of the fight you will receive two Jabberwock Sirloin, but most importantly, you obtain Sword of the Tall, a greatsword that is one of the Armiger weapons in the game.
After you defeat the boss, step on the red plate. It will teleport you back to the entrance.