You can find Lost City of the Tol’vir dungeon within Vir’naal River Delta, Uldum.
The coordinates are (60.3,63.9)
1. General Husam
/i Avoid the Shockwaves that travel along the ground. Charges a player throwing them onto a wall, damages & stuns as slide down. Throws 3 Mystic Traps at players locations, keep away from these to avoid detonating.
Heroic Differences: Detonate Traps will begin the 5 second countdown to detonate all the active traps.
/i Avoid poison puddles. Don’t stand behind boss during Dust Flail (whips tail). Rages at 30%. Scent of Blood inflicts damage to a player, this also attracts Frenzied Crocolisks to attack them. Augh appears in fight, avoid his Whirlwind & Smoke Bomb.
Heroic Differences: When boss dies Augh steals loot & becomes attackable. Avoid frontal cone Dragon’s Breath. Enters Frenzy increasing attack speed & damage by 60%.
3. High Prophet Barim
/i Plague of Ages jumps around players dealing nature damage. Move out of Heaven’s Fury. At 50% forces you to kneel & rips players souls. Defeat Harbinger of Darkness, kill Soul Fragments quickly. Return to your body to continue boss fight.
Heroic Differences: Blaze of the Heavens summons a phoenix, if it reaches 1% health will transform into an egg & heal. After 20 seconds egg will hatch into a new phoenix. Phoenix also leaves fire patches on the ground, avoid these.
/i Avoid standing near cloud storms. Kill all 3 adds. Wailing Winds knocks players around platform & deals nature damage. Minions release Tempest Storms at 5% health. Boss absorbs Tempest Storms & blasts 2 players with nature damage.
Heroic Differences: Servants cast Lightning Charge, inflicts nature damage. When boss absorbs Tempest Storms blasts all players instead of 2.