You need a Winding Tower Engraving Stone to get a legion quarry operational.

You can get the Winding Tower Engraving Stone from Heypia, a trader for legion items.

Come and see me again when you've bought a Winding Tower Engraving Stone[pl:"Stones"].
Did you buy a Winding Tower Engraving Stone[pl:"Stones"]?
Very good.

Talk to me again if you want to find out more about the legion quarry.
Winding Towers have been set up all over Dumaha to excavate Odians.

You can use Winding Tower Engraving Stones to mark Winding Towers as your legion’s property. You can hog unused Winding Towers and also fight the Elyos for their Winding Towers.

But be warned! The Elyos will naturally try to stop you from using a Winding Tower Engraving Stone, Player.
As soon as you've marked a Winding Tower as your legion's property, you can use it to excavate Odians at certain times.

Then all that's left is for you to collect the Odians.

But you should know that these Winding Towers can't be kept running forever. They overload after 30 minutes and stop for a while.

So, use your Winding Tower Engraving Stone[pl:"Stones"] and get a quarry up and running.
Legion quarries are only available to trustworthy Asmodian legions.

Please contribute to the development of your legion and the Asmodians too, Player.