In order to enter Castrum Meridianum, reach level 50 and progress the main storyline up to the quest "Rock the Castrum."
Castrum Meridianum is a story-driven dungeon with frequent cutscenes. It is also only the second 8-man dungeon in the storyline, so the fights will stay fairly simple to ease you into the larger group content.
Clearing this dungeon will reward 100 Allagan Tomestones of Philosophy.
As soon as you enter the dungeon, you will see a large number of guards, as well as two Searchlight Terminals. You will only need to pull the guards standing near the terminals, as turning them off will trigger a cutscene and cause the remainder of the guards to flee.
Don't forget to grab the coffer which is off to right side of the Searchlights.
The only ability in this encounter that can even dent your health pool will be Magitek Cannon. As long as you move out of the ground indicator for it, this fight is will be very easy. As with most bosses, face this one away from the group.
Occasionally, four adds will spawn, two in front of each door. You can tank the boss in front of one of the doors so that the adds on that side are picked up immediately. The off-tank should run to the other door and grab those.
With the boss dead, jump into one of the Disposal Chutes to proceed. Here, you will fight Magitek Reapers, who use the same ability as the first boss, Magitek Cannon. You will also fight Magitek Vanguards, which use Drill Cannon, a frontal column. Make sure you disable the Searchlight Terminal to send a group of Magitek Armor running.
You will also encounter search lights in this area. If you get caught in one, you will spawn two Magitek Death Claws. While these are easy to dispatch, you should try to avoid getting caught.
Before fighting the next boss, run down the hill to the Pump Station. Here, you will find two Unstable Panels. Plant explosives on both and head back to the boss.
This boss is very similar to the first boss. The vanguard should be faced away from the group, with the tank dodging Drill Cannons and Overcharge. The adds will spawn in front of all three doors, so tank in front of one of the doors, with the offtank grabbing the adds from the other two doors. The Magitek Reaper that spawns near the end of the fight can be off-tanked and ignored by the DPS.
Grab the imperial identification key dropped from the Magitek Vanguard and head north, where Cid will blast a hole in the door. Here you will find another Searchlight Terminal, more Magitek Armor, and a new type of enemy, a Magitek Colossus. These use Grand Sword, a large frontal slash, and should be faced away from the group. They also use Exhaust, a frontal column for everyone to dodge.
Once you reach the generators, Cid will start working to destroy them, which spawns the next boss, Magitek Colossus Rubricatus.
As with the previous bosses, the main mechanics here are a frontal and adds. One tank should pick up the Magitek Colossus Rubricatus and tank him at the top left side of the ramp that he spawns on. Healers should stand at the top right side of the ramp. This will pile up all the adds, making them easy to AoE down. Be sure to dodge the Vanguard's Overcharge and Drill Cannons. Other than that, just stay spread out to lower damage taken from Magitek Ray and move out of Exhaust. You can either off-tank the Magitek Vanguard to the side and ignore it, or have the DPS kill it.
Pick up the imperial identification key and head south towards the final undiscovered area. Opening the Magitek Terminal will reveal rows of Magitek Colossus. Rather than fight them, hug left and head up the ramp to disable the final Searchlight Terminals.
When both are disabled, you will come under fire from an aircraft and two Magitek Colossus will spawn. Each tank should take one of them and face them both away from the group. Kill these first and then use the cannons to bring down the airship.
This fight is similar to The Black Eft, with a twist. There are Mark XLIII Artillery Cannons with Magitek Missle piles near them. Clicking on one of these piles with trigger a Magitek Loader to carry a missle over to a cannon. A healer or tank should be clicking these piles to load up the cannons while a DPS or Healer tanks the boss in the middle of the room. You can either load up all four cannons and do a count-down to fire them, or just fire them as they're loaded. These should be fired by a DPS or Healer. Once you fire a cannon, move to the middle, as you will have aggro on the boss.
To make using the cannons more difficult, guards will attempt to kill both the Magitek Loader and the Cannons. This is where tanks come into play. One tank should focus on each side, picking up all the adds and dragging them into the middle with the boss. The cannons will deal AoE damage, quickly taking out any adds.
If you have either the boss or an add attacking you, always move to the middle until you no longer have aggro.
The boss will now fight without Magitek Armor. It will deal higher damage to the tank than before and will have an entirely new set of abilities. Everyone should dodge the abilities Stunning Sweep and Angry Salamander. The ability Aglaia Climb is also avoidable by running behind it, though it does not have a ground indicator.
At 75%, 50%, and 25%, it will use Order to Attack, spawning a large number of 7th Cohort Secutors which will all focus on a single target. If these focus on you, don't move and let everyone AoE them down quickly. At 25%, it will use Order to Attack again, but this time it will spawn a Magitek Colossus along with the Secutors. The offtank can take the Colossus off to a corner and leave the group to focus on the boss. The Colossus will despawn when the boss is defeated.
This boss drops 100 Allagan tomestones of philosophy.
On the Quest: Rock the Castrum
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