Blizzard have extended the Feat of Strength associated with the Mimiron’s Jumpjets mount from the Secrets of Azeroth Arcane Forge event! The mount will be available later as well, but the Feat of Strength was limited to only a few days and had already expired. However, Blizzard are now extending the period when you can get the Arcane Influence achievement until 2:00 PM PDTon Wednesday!
Feat of Strength (Source)
It is taking a little while to stabilize the Arcane Forge permanently.
This will result in more arcane disturbances in Valdrakken, with the last one projected to be at 2:00 p.m. PDT on Wednesday, September 13, which means more time to get the limited time Feat of Strength Arcane Influence.
Thereafter, the forge will be permanently empowered for you to continue crafting your Mimiron’s Jumpjets.
The event itself is pretty simple as you need to get Power Sources (which are marked on the map) to the Arcane Forge in Valdrakken. The event is active every 4 hours.