Memories of Fel, Frost and Fire

Short strategies for all bosses. (%s to be updated)
Key: Boss (boss % you start at -> boss % needed to win)

The Burning Crusade

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• Lady Vashj (50% -> 25%): Tanks keep her moving out and away from poison, it's a death trap for melee when she roots. Tank and spank.
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• Kael'thas (50% -> 30%): Ignore the boss at the start. Kill Eggs > Pheonix, because they will endlessly hatch. Then tank and spank.
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• Archimonde (50% -> 25%): Tanks keep him moving out and away from fire. It's a high chance of death when feared through it. Use the special action button when thrown in the air.
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Wrath of the Lich King

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• Heigan (64% -> 35%): Where you start is where the dance starts. Mark tanks, and have everyone follow. This should happen both channeling and attacking phases. Dispel a lot.
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• Anub'arak (75%-50%): Don't hero/BL at start, he submerges quickly. Range kills the ice sphere above. Melee kills the adds. If chased by spikes -> run into ice. Hero/BL when he comes up and get him to 50% to win, or you will go through a second submerge phase.
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• Lich King (? -> 25%): Spread (including ranged). Kill valkyries immediately. Defile (black pool on the ground) will wipe raid in seconds and is cast after valkyries. Melee spread out from boss when he casts defile. When he runs to mid and casts winter, get to edges and spread out. Kill adds. When winter ends, run in, as the floor will collapse. For the last bit, watch for defile again, which is cast after vile spirits. TLDR: get out of/avoid defile; it will kill everyone in seconds.
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Cataclysm

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• Cho'gall (35% -> 10%): Simple tank and spank. Kill Adds. If corruption at full, face away from allies.
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• Nefarion (75% -> 65%): Get to the platform you start next to. Interrupt and kill add. Range attack boss after. The fight should end just as the last add dies, and the lava recedes.
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• Ragnaros (50% -> 35%): Stack at start on left. When molten seeds dropped, everyone moves to the right side and spreads out. Stay out of the fire. Kill adds. Watch for waves from hammer slam. When boss submerges, sons will spawn and beeline for the hammer. Kill them before they do, or they do massive AoE.
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Overall
The sequence is as follows: [TBC: Vashj, Kael'thas, Archimonde] | [WotLK: Heigan, Anub'arak, Lich King] | [Cata: Cho'gall, Nefarion, Ragnaros]. Whenever you fail, you have to go the start of that sequence. So if you fail on Archimonde, you will need to start again from Vashj.

OK, this may be silly but I just found it...there is a portal to the Caverns of Time in Orgrimmar. As you exit the Pathfinder's Den, where the portals to the capital cities etc are, there is a turning on the right before you get to the main corridor. Follow it down and there is a room with a portal to the Caverns of Time.

Since this is a feat of strength, it won't show in your achievement list until it's earned. To track it (and untrack it), use the following scripts:

/script AddTrackedAchievement(13931);

/script RemoveTrackedAchievement(13931);