The looted arsenal

Rebuild it to unlock 1 Smithing activity, get 2 more bank slots and open a shop.

Needs

Any one of: Smithing level 15, Mining level 18
Find it first. A scouting trip can find it once a place next to it is rebuilt and you have the level above.

1 Smithing activity you can only do here: Reforge drowned iron
+2 bank slots
A shop that sells Padded cap, Soldier's sword belt, Oiled scabbard, Sparring gloves, Army biscuits and Wound kit
Smithing +10% speed while you are here
300 coins, once
205 Construction XP, a little for each item as you hand it over
It adds to your tax income

In ruins

The weapon racks are empty and the anvils are cracked. The war took its weapons from here first.

Rebuilt

Full racks, a practice yard, and smiths who sleep warm above their work.

“Smith here and the work goes faster. This yard will arm the whole valley.”
— Armourer Tunç