Return to Sir Durnstad and give him the fragment for your reward.
Notes
The guardians respawn very quickly, and do not leave a corpse or drop any loot.
The stockpile has 100,000+ health, is it indirect magic immune, any de-buffs, drains fail. But any direct magic spells (of any sort) can hit. It has zero missile defense. It regenerates health so can be very difficult to kill if you are alone.
Sir Durnstad tells you, "Greetings. I have been stationed here by the Queen in order to assist in the slowing of the Gear Knight forces invading Dereth."
Sir Durnstad tells you, "To that end, my scouts have identified a stockpile of Aetherium Ore at the bottom of one of the Gear Knights excavations. If you are willing, I am authorized to send adventurers to destroy the stockpile, and reward you if you bring me proof of its destruction."
Sir Durnstad tells you, "You will find the tunnels they have dug at 10.4 S, 75.2 W. They've been reinforcing the location since they created it, so expect defenses in place."
Sir Durnstad tells you, "My reports indicate that the resistance in the site is quite high, so you may want to recruit a few of your compatriots to assist in this mission. Just make sure they all come to me first, so I can properly reward them upon your successful completion."
Sir Durnstad tells you, "You'll find the excavation they're using to store their Aetherium Stockpile at 10.4 S, 75.2 W. Get in there, destroy it, and bring me back some of the remaining debris as proof."
Rewards Dialog[]
You allow Sir Durnstad to examine your Bright Aetherium Ore Fragment.
Sir Durnstad tells you, "A job well done. I'll take the remaining debris off your hands, and reward you."
You hand over 1 of your Bright Aetherium Ore Fragments.
You've earned 20,000,000 experience.
Sir Durnstad gives you Mana Forge Key.
Sir Durnstad tells you, "It'll take them a while to build up another stockpile. Come back in a week, and I'll have another mission for you."
Other Interactions[]
With a thunderous explosion, the stockpile is destroyed, leaving only scattered pieces of debris to mark its passage.