Out of House and Home is a level 9 main scenario quest.
The Silver Ore Cluster is used on the Narrow Fissure in the tunnel in Black Brush.
FFXIV: Main Story – Out of House and Home (Ul’dah)
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Warin: Let’s get to it then, shall we?
Warin: Ore wagons pass through this station every day─but not without incident.
Warin: Wagons coming and going from the Dispatch Yard to the south must pass through a tunnel by Fesca’s Watch─a tunnel in which some genius saw fit to put an ore storehouse, creating ideal conditions for a coblyn nest!
Warin: So now the ore-loving beasts have taken up residence in a tunnel we dug, and we’re practically delivering meals to their doorstep!
Warin: But no more. Inside the tunnel in question, you will find a narrow fissure where the coblyns hide. Use this silver ore cluster to lure out the creatures, then slay them.
After you lure the coblyns out, slay them, and return to Warin:
Warin: Well done! It shan’t be easy work to keep the tunnel free of coblyns, but our wagons should be able to go unmolested for a time.
Warin: Disruptions to ore shipments threaten not only the interests of Amajina & Sons Mineral Concern, but of Ul’dah herself. One might liken these train tracks to veins that bear our nation’s lifeblood.
Warin: If only we had more men/[GENDER] like you to lend a hand.