You can find the Well of Eternity dungeon within Caverns of Time, Tanaris.
The coordinates are (64.3,49.5)
/i Avoid fire left on ground from Fel Flames. Healer be careful of how much you heal player with Fel Decay as you take it back as damage. Boss goes invisible, dodge the eyes. Avoid detection for 40 secs & boss is stunned & takes more damage.
2. Queen Azshara
/i Random players become puppets, destroy the strings to free them. Must interrupt Total Obedience (turns all into puppets). Kill Arcane Magus, Frost Magus then Fire Magus. Kill all Magus adds to defeat boss.
3. Mannoroth & Varo’then
/i Kill Varo’then (once he’s down click sword to hit Mannoroth). Keep on move to avoid Fel Firestorm. When Tyrande collapses mobs run in, all players get into the moonlight for buff & kill Dreadlord Debilitators. When sword hits Mannoroth nuke him down.