You can find Halls of Origination dungeon within Uldum.
The coordinates are (71.8,52.1)
After killing 2nd boss Anraphet you can take one of the two Transit Devices (shown as * on map). This shortcut will transport you back to the previous room. You can also take a Transit Device after 3rd boss.
1. Temple Guardian Anhuur
/i Avoid area with Burning Light. Dispel Divine Reckoning. Interrupt Reverberating Hymn. At 66% & 33% (Shield of Light) channels energy from beacons becoming immune to damage. Need to activate 2 Beacons of Light in pit below, careful of the Pit Vipers.
Heroic Differences: On Shield of Light activating the a Beacon of Light requires 10 seconds to complete.
/i Channels Alpha Beams at a player, run from shadow patches. Omega Stance inflicts shadow damage & reduces movement speed of all players. Crumbling Ruin decreases max health of players by 8%, this stacks.
Heroic Differences: Alpha Beams leaves permanent shadow patches, avoid these.
3. Earthrager Ptah
/i Launches Flame Bolts that inflict fire damage to 2 players. Move away from erupting floor to avoid Earth Spike. At 50% casts Earthstorm, this summons Horrors, Scarabs & Quicksand. Avoid the pools of Quicksand.
Heroic Differences: Launches Flame Bolts that inflict fire damage to 3 players. During Earthstorm a sand vortex also moves around the sand, keep away.
4. Isiset, Construct of Magic
/i Face away from boss for Supernova. Move away from Astral Rain shower. Kill Celestial Familiars. Veil of Sky shield absorbs damage by draining mana & fires back spells cast. At 66% & 33% kill Mirror Image of spell you want to destroy.
5. Ammunae, Construct of Life
/i Interrupt Wither. Steals the life & power of a player giving himself Life Energy, also damages & stuns. Kill Seedling Pods quickly, any left will be transformed into Bloodpetal Sprouts. Avoid Spore clouds on ground.
Heroic Differences: Seedling Pods will heal boss for 1% of max health every 3 seconds, kill them quickly.
6. Setesh, Construct of Destruction
/i Summons bubbles of void energy around room, damages all players. Chaos Blast is thrown at a players location & inflicts damage to all nearby, avoid standing in area. Keep away from Seeds on floor as will explode. Opens a portal that summons Void adds.
Heroic Differences: When portal opens you must attack & destroy it to stop more Void adds coming through.
7. Rajh, Construct of Sun
/i Interrupt Sun Orb & Inferno Leap. Summons a vortex that grows & moves around room, keep away. When boss has less than 10 Sun Energy goes to middle of room to recharge, this inflicts fire damage to all players but also increases players damage by 100%.
Heroic Differences: Solar Fire As the vortex (Solar Winds) moves around room they create patches of fire, avoid standing in these.