The Culling of Time

The Culling of Time is a Lich King heroic achievement needed for, rewarding the Reins of the Bronze Drake.

Strategy
The ideal group to achieve this would have:
 * Paladin Tank (or well geared/skilled warrior. A warrior utilizing Charge may get out of range of a healer, and must be able to take a few hits or utilize abilities with cooldowns, like Last Stand and/or Enraged Regeneration)
 * DPS (any type with AoE spells/abilities)
 * Healer with AoE or Mass Heals (Druid HoTs, Shaman's Chain Heal, Paladin's Beacon of Light)

Preliminary Phase, Non-timed

 * 1) Talk to and get the Arcane Disruptor
 * 2) Reveal the crates of plagued grain using the Arcane Disruptor
 * 3) Chromie will appear further up the road to the north-west
 * 4) Talk to Chromie again and this will start the cinematic event where orders the city purged
 * 5) If you've seen the cinematic once, I would recommend running past it and into the grand gateway of Stratholme and begin preparing for the instance (Food, Flasks, Buffs, etc.)

Phase One: Waves
In the first phase, there are a total of 5 random spawn points:
 * Kings Square East, right in front of the gateway to Festival Lane. First Pull will be here.
 * Kings Square West, just south of the closed gateway to Market Row.
 * Kings Square Southwest, Next to the fountain
 * Festival Lane North, Near the closed gate to Market Row and will path south of the city hall.
 * Festival Lane South, Near the fountain.


 * 1) Arthas will eventually join you in the gateway. Once Prepared, talk to him and start the cinematic with . Run past him towards the split in the road and turn to the right, facing the gateway into festival lane. Your first pull will be 3 Ghouls, and they will spawn right in front of you shortly after Mal'Ganis disappears. The 25 minute timer will start as soon as these mobs spawn. You will also see a whisper from Chromie.
 * 2) Run to every spawn point as soon as the flag/arrow pops up on your mini map for the next pull. Again, do not stop to loot!
 * 3) Every wave will seem a random variaty of mobs, however they spawn the same way every time. I would recommend killing them in this order: Necromancers, Crypt fiends, Abominations, and Ghouls.
 * 4) Between the 5th (First boss, ) and 6th waves, there will be a little less than a minute to loot and allow mana users to replenish their mana.
 * 5) The 10th and final wave will . If he spawns (and you kill him) in Festival Lane, you may have to wait for Arthas to run from the entrance of Kings Square to city hall (Northern most part of Festival Lane). This will give your casters/healer to replenish their mana.
 * 6) Once Arthas is standing in front of city hall, talk to him as soon as possible to start the next phase.

You should have 12 or 13 minutes remaining...

Phase Two: Infinite Dragon Flight

 * 1) Arthas will enter city hall and will attack one of the 3 humans standing there. The human will laugh at Arthas and the 3 will transform into Infinite Dragonkin. The female one in the middle will spawn into an . It is recommended as they are casters, and have weak aggro tables, to kill these first.
 * 2) After the first 3 are dead, quickly run up the stairs in the back of the room. Ranged DPS and healer should proceed to the tables on the landing, while the tank and melee DPS wait a few steps from the top of the stairs. 4 more will spawn from a portal. Ranged DPS should wait by the railing for the next pull.
 * 3) The next pull will be a little tricky, and I've seen it done a couple ways. Basically, what will happen is Arthas will run forward into this enclosed hallway, and 2 (Caster) will spawn on the closest side and 2  (melee) will spawn on the far side. It will take them 2 or 3 seconds before they attack after spawning.
 * 4) Warrior: Run to far end, Thunderclap and aggro the hunters, then Charge one of the agents and Challenging Shout.
 * 5) Paladin: Consecration under the spawning agents, and run to the far end, aggro the hunters and use Avenger's Shield on the agents to silence and further establish threat.
 * 6) Once that 4-pull is downed, run into the next room. Another 4 pull will spawn in the middle of the room.
 * 7) After those 4 mobs are downed, the boss,, will spawn on the steps toward the back of the room. A short conversation will ensue between Epoch and Arthas.
 * 8) Kill Epoch quickly and talk to Arthas, immediately! Loot after talking to Arthas and he is walking to the book case. Healer and casters should replenish their mana during the looting.
 * 9) Take the secret passage that Arthas just opened (jump over the railing on the other side to save a few seconds).

You should have ~8 minutes remaining...

The next phase will be the hardest.

Phase Three: The Gauntlet

 * 1) The tank and healer should run ahead and start grabbing 2 or 3 (or more, if the tank is able)
 * 2) One DPS will stay back a second or two and talk to Arthas at the doorway, then immediately join the fray.
 * 3) The mobs in this area are on really long paths, so it's very easy to get overwhelmed if you take on too much too fast.
 * 4) Beware the cultists, as they will generally go after the healers if the tank doesn't grab them first.
 * 5) Keep moving, if needed, when you're approaching the gateway, drag a couple elite mobs with you to the next, using Charge or Avenger's Shield.
 * 6) Don't stop in the archway, even though Arthas suggests it. Move straight through it to the next set of mobs.
 * 7) The gauntlet will end after you reach Market Row.
 * 8) Do not talk to Arthas. Instead, take a left and head into Market Row. There you will find the optional boss.

You should have 3 to 5 minutes remaining...

Infinite Corruptor Boss Fight

 * 1) This boss fight is your typical tank-n-spank.
 * 2) If you're getting low on time (i.e. 1 minute or less remaining), pull him back as far as you can into market row.
 * 3) Should the timer hit 0 he will retreat back to his portal and disappear, however DPS can still hit him while he's retreating to his portal, so there is still a chance DPS can manage to kill him during his retreat. (From personal experience, and barring any change that the developers may or may not have implemented, this still counts as a kill and you will still get the achievement and loot.)