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Comment by Aisenfaire

Nullification Dynamo

Major Power: Empowered Null Barrier

Rank 1: (Instant, 3 min cooldown) Gain an empowered Null Barrier, absorbing 113,717 magic damage for 10 sec
Rank 2: (Instant, 2.3 min cooldown) Gain an empowered Null Barrier, absorbing 113,717 magic damage for 10 sec.
Rank 3: (Instant, 2.3 min cooldown) Gain an empowered Null Barrier, absorbing 113,717 magic damage for 10 sec and instantly remove all harmful Magic, Curse, Poison and Disease effects on you.

Minor Power: Null Barrier

Rank 1: Every 20 sec, gain a Null Barrier, absorbing the next 22,638 magic damage you take for 10 sec.
Rank 2: Every 15 sec, gain a Null Barrier, absorbing the next 22,638 magic damage you take for 10 sec.
Rank 3: Every 15 sec, gain a Null Barrier, absorbing the next 22,638 magic damage you take for 10 sec. When Null Barrier expires, it implodes dealing Shadow damage equal to the total amount absorbed, divided among all nearby enemies.

Drop Location: Mechagon Reputation

Rank 1: Obtain Rustbolt Resistance reputation Honored and buy it from the Quartermaster for 2 S.P.A.R.E. Crate and 2 Galvanic Oscillator. Cost reduced to 2 S.P.A.R.E. Crate and 1 Galvanic Oscillator after learning Rank 1 of one Mechagon Essence.
Rank 2: Obtain Rustbolt Resistance reputation Revered and buy it from the Quartermaster for 20 S.P.A.R.E. Crate and 10 Galvanic Oscillator. Cost reduced to 8 S.P.A.R.E. Crate and 4 Galvanic Oscillator after learning Rank 2 of one Mechagon Essence.
Rank 3: Obtain Rustbolt Resistance reputation Exalted and buy it from the Quartermaster for 40 S.P.A.R.E. Crate and 25 Galvanic Oscillator.
Rank 4: Obtained from Rustbolt Supplies.

Items:

Source: https://www.wowhead.com/guides/heart-of-azeroth-essence-overview

Note: Rank 4 is cosmetic only, which is why the figures provided only matter up to rank 3.

July 12 Hotfix:

The cost of the Rank 3 Essences available from the Rustbolt Quartermaster has been reduced to 15 Galvanic Oscillators (was 25 Galvanic Oscillators) for the first Essence. Subsequent Rank 3 Essences now cost 6 Galvanic Oscillators (was 15 Galvanic Oscillators).

Source: https://news.blizzard.com/en-us/world-of-warcraft/23036677/hotfixes-july-16-2019

Comment by Phasha

In the current version of Icy Veins' article Blood DK PvE Essences, their authors Mandl and Panthea asserts that this is one of the strongest tanking major essences, mainly due to its ability to purge all debuffs on you. The purge, however, is only activated for Rank 3 and above, requiring exalted rep with the Rustbolt Resistance.

The Rank 1 and 2 do not have the ability to purge all debuffs.

Comment by Stealthjett

Can anyone confirm if you can buy this on any of the characters not listed? I raised rep for Rustbolt for my Mage. I would hate to have to do this again on my warrior.

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Null Force Containment Unit

Rank 1
Item Level 50
Binds when picked up
Unique

Use: Infuse your Heart of Azeroth with Nullification Dynamo.
Requires Friendly reputation with the Rustbolt Resistance. (Cannot purchase if already known.)

Major Power:

Empowered Null Barrier

Instant	3 min cooldown

Gain an empowered Null Barrier, absorbing [28564 * (1 + Versatility)] magic damage for 10 sec.

Minor Power:

Null Barrier

Every 20 sec, gain a Null Barrier, absorbing [5686 * (1 + Versatility)] magic damage for 10 sec.

"It looks completely void of energy and matter, yet the unit is clearly heavier than the containment unit itself."

Null Force Containment Unit

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