Cathedral of Eternal Night is a dungeon whose entrance is located in The Broken Shore on the continent of The Broken Isles in the World of Warcraft game. The minimum level for this dungeon is 110+. The dungeon contains 4 bosses. The end boss of Cathedral of Eternal Night is Unknown.
Cathedral of Eternal Night is a progression dungeon. A progression dungeon will allow people who have low gear to gain higher gear without grinding raids whilst everyone else is enjoying the latest raids. It located on the side of the Tomb of Sargeras and is a completely separate dungeon to the main raid on the island. Despite its name, it is not fought in the dark.
Clear the room of the trash before hand then attack the boss. For a boss of his size, it will come as no surprise that he'll be stomping all over the ground and making people jump when he stomps on the ground.
If you are doing the achievement, make sure you know where the budding flowers are so that you can run to them. You need to run to each budding flower once the fulminated flower has been destroyed. If you can, mark the flowers so you know where to run to.
The boss will appear once the room has been cleared including the multi-eyed creature. Enter the room and start the fight. There are a number of things to be aware of.
He'll do his little bravado when you enter the room but won't start automatically so you need to hit him. He's a melee boss so watch out for his pole. There are two things to know about this boss.
Mephistroth will appear in the same room as the previous boss so long as you clear all the winged trash that is the room at the time. Illidan will appear in the room then disappear again before the boss finally appears. You will have faced off against this boss earlier in the questline but would not have killed him.
During the fight, he'll cover large areas of the ground in what looks like sick, sorry but there's no other way to put it. You have to describe the stuff on the ground so you need to keep moving all the time.
You will notice a new spell, a shield, the Aegis of Aggramar which you need to use when Illidan falls to the ground. Mephistroth will split up to a number of spectral versions of himself around the room. He'll fire spectral balls at illidan, you need to protect him by clicking on the shield to deflect the balls.
To get the achievement, you just need to protect Illidan twenty times so keep a count of how many otherwise you'll waste your time by under or overprotecting him. Eventually, Mephistroth will get tired and return to normal. Illidan will return to where he was hiding before. Mephistroth will be killable now.
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