Steamvault

The Steamvault (also known as the Steam Vaults) is the level 70 wing of the Coilfang Reservoir. No key is required to enter. You must defeat the first and second bosses and operate the control panels behind them in order to enter the room with the final boss.

All mobs give Reputation to Cenarion Expedition through Exalted. Rep Given: Trash: 12, 2 (non-elite), Bosses: 120, Full clear 1,662 rep. (1,782 if you take the time to kill all of the slaves as well.) The fastest path through the instance nets ~1100 rep.

In Heroic Mode, the fastest path gives roughly 1550 rep, and a full clear will give 2,559 rep.

The instance can be soloed in normal mode at lvl 80. Heroic Mode can even be soloed by lvl 80 plate dps.

Overview
This is a challenging instance, with an unusually large number of mobs, and a couple of reasonably difficult boss encounters. Trash pulls are made up of 2, 3 or 4 elite Naga humanoids, of 5 water elementals (1 elite and 4 non-elite,) or of a single elite bog giant. Because of the large number of 4-humanoid pulls, the instance favors DPS classes that possess humanoid Crowd-Control abilities: Mages, Hunters, Rogues, Warlocks and Shadow Priests. If not all 3 of the group's DPS members can CC humanoids, a skilled tank can fairly easily hold more than one mob at once, although in heroic mode this is best left as a last resort (for broken CC's) to avoid unnecessary wipes.

Almost every pull has a slightly different number and combination of mobs. Make sure that casters are taken down right away (or crowd controlled). The melee can usually be saved for last. A large portion of the instance can be skipped if you pull the 2 guards at the entrance followed by the two bog lords on the right and follow around the right hand side. However, you do not get rep for mobs you do not kill. Excessive skipping, as emphasized below, is also highly likely to cause wipes.

The Oracles and Sirens are very dangerous, with AoE silence and AoE fear they can block your healer for ten seconds or make you pull extra groups. Typically you want them crowd controlled at first and dealt with after the other mobs are dead. Be aware though if you as a mage polymorph the siren and she breaks early she will be after you. As soon as she gets into range she will try to silence you, making you unable to crowd control, frost nova her etc. If somebody tries to assist you she will cast an AoE fear, so ensure that person can break it, especially if there are other mobs they may be feared into.

A Mind Control pull is an effective way to take out a caster early. If you Mind Control the Sorcerer as the pull, then the other mobs will turn to kill the Sorcerer. When you are about 30% health cast Frost Nova. This will trap the remaining mobs in the pull and allow time for your tanks and other crowd controlling characters to react. This also works in Heroic Mode.

Lore
The Steam Vaults serves as the mechanical heart of Naga's draining operations in Zangarmarsh. The mechanisms on display within the massive cavern supply the power for the actual act of removing the marsh's water. As a result, the Steam Vaults is perhaps the most strategically important wing of the Coilfang Reservoir for adventurers looking to put a stop to Lady Vashj's efforts.

Dungeon Denizens

 * Broken
 * Crabs (critters)
 * Frogs (critters)
 * Fungal giants
 * Leper gnomes
 * Mana surge (one, Second Fragment Guardian)
 * Naga
 * Snakes (critters)
 * Water elementals

Bosses

 * Hydromancer Thespia
 * Thespia is a naga with two water elemental bodyguards. She herself can cast a lightning cloud that does substantial nature damage to anyone under it and has an 'enveloping winds' spell that stuns the target for five seconds.


 * Mekgineer Steamrigger
 * Steamrigger is a mechanical similar to Thermoplugg's pounder. At about 75%, 50%, and 25% health, Steamrigger will call gnomes to repair (heal) him.  He also has various special attacks that do not do tremendous amounts of damage.


 * Warlord Kalithresh
 * Kalithresh is a naga working for Lady Vashj. In combat, he periodically attempts to channel energy from the nearest of the tanks of fluid in his room.  If he completes the 10 second channel, his attack speed increases by 100% and his damage by 75%; this effect is stackable.  Once he reaches this state, a wipe is generally imminent and unavoidable, and it is thus imperative that the entire group focus their damage on these fluid tanks as soon as he begins channelling from them.

See the individual boss pages for more detailed information and strategies.

Warning: Pull Thoroughly
The single most important thing to be aware of for the early parts of this instance is the necessity for thorough pulling.

Group leaders in this instance have a tendency to try and rush past various groups of mobs, and early wipes tend to be either due to stray runners triggering other groups of mobs, or members of ranged classes accidentally backing into patrols when trying to get range. Once the group's path through the instance has been decided on, it is vital that the group thoroughly clears all mobs within radius of the determined path, if the group wishes to avoid wipes. The group's leader should not insist on trying to go around mobs excessively in the name of speed or convenience, since the amount of downtime caused by a wipe will generally be considerably more than the time necessary to ensure a safe path through the instance.

List of Trash Mobs
This is a non-exhaustive list of some trash mobs that can be found in the Steamvault.

Quests

 * Given by Watcher Jhang at the entrance to Coilfang Reservoir.
 * Starts with a random drop of the same name inside the instance.
 * The repeatable follow-up to turn in Coilfang Armaments.
 * Given by David Wayne within Terokkar Forest.
 * Random daily quest given by Nether-Stalker Mah'duun in the Lower City of Shattrath.
 * Given by Khadgar at the Terrace of Light in Shattrath City, this is step 6 in a quest chain to obtain the Master's Key that starts with Archmage Alturus at the entrance to Karazhan in Deadwind Pass. The Second Key Fragment is found in this instance. It can be located in the water just in front of the first boss Hydromancer Thespia.  This key fragment may be obtained without killing the first boss if simply obtaining the key is your goal.  A direct route to the key requires clearing mobs while hugging the right wall from the start of the instance, take a hard right and up the ramp, and clear enough space to be able to jump into the water.  Dive into the water at the leading edge of the bridge and search the pond for the key giver.  The key may be obtained with six or seven pulls from the start of the instance. This instance no longer requires a key to open the door inside.  There are now panels behind each of the bosses that need to be activated - this will automatically unlock the door.

Loot
See Steamvault loot.