Effects
Oathgold generated: 5 per turn (region_to_region_own)
Upkeep: -5% for Miners and Hammerers units (all armies)
Hero capacity: +1 for Runesmiths
Unlocks Hero recruitment: Runesmith
Hero recruit rank: +1 for Runesmiths (factionwide)
Income generated: 1000
public order +5
Recruit rank: +4 for Miners units