For those who are new to raids, here are a few things to keep in mind. At Level 50+, you can easily complete Icecrown Citadel; in fact, you can even do Heroic 25-Man. There is a zone-wide buff that increases your damage and healing, making things even easier. Make sure your character isn't on Chromie Time, as this will prevent you from entering the raid.
The first two bosses aren't terribly noteworthy, but it is an excellent idea to approach the third fight with a very specific approach for efficiency's sake. Speak to the Alliance's Muradin or Horde's Saurfang, and hop up onto one of the cannons then right click it to "enter". Start sending '1' quickly to raise Heat, but keep it below 97. If it reaches 100, the cannon overheats and cannot be used for a while.
As the enemy gunship approaches, hit '2' to fire a strong attack. At around 90 Heat, you will have plenty of power to deplete the other ship's health before the battle even begins. In most cases, the cannons froze up, and you had to board their ship to take out their battle mage. If you hit it before the fight starts, you've usually done enough damage to finish off that ship right when the fighting starts, and you can skip that step.
Once you've hit the ship, make sure to dismount the cannon just before the encounter starts-the game may glitch out and get you falling to an early demise.
Complete the raid as usual up to this point. To access Professor Putricide in Plagueworks, you'll have to activate two valves. The first is located with Rotface and the second with Festergut, his two other massive bosses within the Plagueworks area.
Get ready to take on Valithria Dreamwalker, the powerful boss hiding in the Frost Wing. If you don't have any healing spells, you can skip this fight. The door behind her is open, so you can head to Sindragosa freely. If you do have healing spells, you can start the fight by fully healing the boss and thus winning the fight.
Once you have defeated all three wings of Icecrown Citadel on the top levels, the teleporter in the middle of the pillar of ice will activate. Hop on it, and away you go to meet the big bad Lich King himself. In Icecrown Citadel, this is the only boss that is different from all of the others; you will not be able to simply kill it with one-shot at the beginning of the fight.
As the Lich King’s health dips below 10%, he unleashes the devastating Fury of Frostmourne. Before it was classified as legacy content, this ability had the power to eliminate all players instantly. Even though it may seem like a setback, getting to this stage of the encounter essentially signifies your victory. The Lich King remains invincible until the following roleplay sequence concludes. As Terenas Menethil II says, "Rise up, champions of the Light!", now is your time to strike. With a bit of luck, you can find that Invincible's Reins may be one of those longed-for loot from the Lich King.
Is Invincible at the Black Market Auction House?
From exclusive mounts to unique cosmetic pieces, the Black Market Auction House has often been visited with the most desired things in-game, and for that matter, Invincible. Note: due to demand for this mount, bidding is likely to move upward rapidly and eventually to quite a high level. The last time Invincible went up to bid it sold for over 7,000,000 gold. It is an expensive way to earn Invincible via the Black Market Auction House in WoW, one that a fortunate few can only afford to pay for.