Mimiron

Mimiron (called Mimir by his friends) is one of the keepers. He once resided at the Temple of Invention, but left after being corrupted by Loken and Yogg-Saron. It is said that his mechanical servants appear to have turned against each other and that several attendants have been piled together in an unorganized manner. The remaining mechagnome guardians were corrupted by an unknown source.

Ancient history
Mimiron is one of the Keepers created by the Pantheon to lead the titan-forged armies against the forces of the Old Gods. He was given power by Norgannon. He and Loken battled and defeated Neptulon the Tidehunter.

After Loken was manipulated by Yogg-Saron and accidentally killed Sif, the wife of Thorim, he was desperate to keep it a secret. Loken arranged for Mimiron's death, making it look like a lab accident, but Mimiron's mechagnome followers saved his spirit and created a mechagnome body for Mimiron to inhabit. He has not been completely sane since.

In ancient times, Mimiron discovered a mineral named kaja'mite and, attempting to determinate its properties, he experimented on various races. He found that the ore was extremely potent and that it increased the intellect of his subjects. One of these subjects was a small primitive life race that roamed around the forests near Ulduar. By consuming kaja'mite, they were transformed into a new, highly intelligent race known as the goblins.

Ulduar
Mimiron first appears as a boss within Ulduar. After defeating him, he breaks free of Yogg-Saron's corruption and aids you in the battle against the Old God. When active, Mimiron provides the following buffs:

Legion
Titanstrike, a gun Mimiron had created for his companion Thorim long ago, was at some point stolen from Ulduar and brought to Shield's Rest on the Broken Isles. During the invasion of the Burning Legion, the gun was stolen again by a vrykul woman named Prustaga, who intended to retrieve the Thunderspark within and gain the power of the Titans. Mimiron worked with Thorim, a hunter hero, and Grif Wildheart (who Mimiron mistook for his old friend Brann Bronzebeard) to retrieve the artifact from Prustaga.

He later sent his projection into Highmountain.

Battle for Azeroth
Mimiron appeared as an Image of Mimiron for hunter adventurers during the Fourth War. He suggested that Hati might still be alive, based on data he's gathered. When the adventurer reached Mimiron, he told them that Hati's essence had managed to escape before destruction and was not actually lost. Mimiron proceeded to locate Hati. He found that Hati's essence had been split in two; one half to be found in Silithus and the other at the Temple of Storms. Soon after, the split essences of Hati were retrieved and absorbed into the Thunderspark thanks to the adventurer. Mimiron had the relic brought back to his workshop where he managed to fuse the essences together, and Hati was reborn.

Visions of N'Zoth
After the escape of N'Zoth from the Last Prison, Magni Bronzebeard had MOTHER check the status of the titan forges from the Chamber of Heart to see where the Old God might strike. When Ulduar was checked, Mimiron terminated the communication; Magni believed his work had likely been interrupted by the call and the keeper had 'hung up the line' in annoyance.

Quests

 * Stolen Thunder
 * The Creator's Workshop
 * Never Hunt Alone

Creations

 * A peerless example of techno-magical engineering, the Titanstrike was designed by Keeper Mimiron, a titanic watcher and brilliant inventor. Securely housed in the heart of the rifle, a relic known as the Thunderspark powers the Titanstrike, harnessing the essence of storms and focusing it into concentrated blasts of energy. The rifle's power source can also be credited to Mimiron, who devised it for his comrade, Keeper Thorim, in ages past.
 * Mimiron also drew out detailed blueprints for a masterwork techno-magical bow along the same lines as Titanstrike, right down to the power source. It is suggested that the plans were originally stored away in his archives.
 * Mimiron created a clockwork race he called mechagnomes. Some of the early mechagnomes became afflicted by the Curse of Flesh, and became the first gnomes.

Quotes
Mortals, I am indebted to you for freeing me from the terrible corruption that besets this place. Though I have not yet recovered fully, I can help you battle Yogg-Saron.
 * Gossip at Ulduar

I can grant you and your friends the Speed of Invention, increasing your damage and movement speed. In addition, I can destabilize the matrices of certain Saronite based life-forms, reducing their attack and casting speeds.


 * Greeting
 * Just carrying the one and-- Yes?
 * Greetings.
 * Time for some science!
 * We can solve any problem.


 * Farewell
 * Everything is science if you write it down.
 * Always a pleasure.
 * Off you go.
 * Fascinating. Lovely chat!

Notes and trivia

 * Mimiron seems quite open to discussing Titan creations, as Brann Bronzebeard spoke to him. In one of his journals, Brann commented that Mimiron "never. stops. talkin'."
 * Mimiron sees Brann Bronzebeard as an old friend by the time of World of Warcraft: Legion.
 * Grif Wildheart also became his friend at some point before the quest to obtain Titanstrike, but is constantly mistaken for Brann.
 * It was previously stated that Mimiron created the mechagnomes in his image, but this was changed with Chronicle.
 * As Mimiron is obviously still alive and active in Ulduar, he can meet the progeny of his own creations, the gnomes of Gnomeregan, though it is not known how Mimiron feels towards them.
 * In Norse mythology Mímir was the giant guarding, the well of wisdom beneath the world tree.
 * Mimiron is voiced by Dino Andrade.