Can you please tell me which is this perk? I just can find one perk in steward which gives -20%, not -50%. Thanks.
I screwed up and had them mixed and matched but there are a bunch of combinations to get at or near 50% wage reduction for castles.
Steward 50 Drill Sergeant (5%)
Steward 75 Stiff Upper Lip (20% for castles)
Riding 225 Cavalry Tactics (mounted 50%)
Bow 150 Hunter Clan (15%)
Crossbow 100 Peasant Leader (ranged 20%)
One Handed 150 Military Tradition (5%)
Two Handed 125 Berserker (10%)
Polearms 175 Standard Bearer (20%)