The Copperbell Mines is a Dungeon in Final Fantasy XIV: A Realm Reborn. Players are required to complete the dungeon as part of their main story questline around level 17-20. It requires a party of 4 players, and features three unique bosses, each with their own mechanics. As the third and final introductory instance, it is a step up from Sastasha and The Tam-Tara Deepcroft in difficulty, while not being excessively hard to complete.
As Copperbell is based in Ul'dah's zones, the enemies within will be similar to those outside. Spriggans, bombs, and more will await players; though most of these do not have unusual strategies, players must be aware of bomb-type enemies, which can explode and cause instant death to anyone caught in the radius.
The first boss of Copperbell Mines is a two-stage fight, beginning with an onslaught of weak spriggans, which simply must be gathered and killed by the party. Healers should not be hard pressed, however they may pull aggro due to their casting, and tanks must be aware so they are not swarmed in the early going. After the spriggans are done spawning, Kottos himself joins the fray, and is a straightforward battle afterward. He does have a weak AoE attack, but should die within seconds of spawning.
A blob/flan type monster, the Ire is not fought in the traditional manner, as it is immune to damage. During the fight, players will right click an "Improved Blasting Device" switch near the middle of the room. This will spawn a Blasting Cap bomb monster that will eventually explode; the boss must be caught in the blast radius, which will cause it to divide into two smaller blobs. These steps are repeated a second time, to create 4 blobs, then a third time to create 8 blobs, which can then be damaged and killed by the party. The only mechanic change mid-fight is that spriggans will spawn and attempt to kill the blasting cap, so those adds must be killed by the DPS to win the fight.
Note, the blasting cap and the Ire itself (with exception of the final incarnation when it has split into 8 pieces) should not be attacked by anyone except the tank, and only then to hold threat during the fight.
Note, the explosion from the blasting cap will kill any player caught in its radius as well, so it must be avoided.
The final battle of Copperbell Mines is completed by utilizing a great deal of control over the adds that spawn throughout the fight. Gyges himself has relatively few mechanics, though a frontal cone AoE attack can cause a great deal of damage to the unwary if they are struck by it. When the boss nears half health, he will begin to run to two large boulders in the room, and begin attacking them. The first boulder will always be destroyed by the boss (this cannot be prevented), and will allow reinforcements to spawn, which will attempt to break the second boulder. The DPS will need to kill the adds to keep the boulder from being broken, then return to the boss to continue damaging him. If the second boulder breaks, two adds will join the fight every few seconds, and attack the party.
A melee character using a single-target Limit Break can often make this fight quick if it is used after the first boulder has been destroyed. A caster using a AoE Limit Break can also help to recover if a large number of adds spawn, however that should be kept as a last resort, with damage focused on the boss instead. All adds despawn when Gyges reaches 0 HP.
After the first boulder breaks, ignore the adds and just burn the boss down as fast as possible. He will die before the adds can even break the second boulder.