Sovereign’s Swords are the distinctive weapons of the Sovereign’s Finest, the upper ranked members of the Kingdom’s forces. These special agents are the Sovereign’s hands, imparting justice and rulings when needed, being embassy, or doing special duties.
Silk Armor? The Mongols wore silk undergarments under layers of leather armor. Why? Because silk is very strong. If an arrow hit them and made it through their armor, it would usually not have enough energy to puncture the silk. It could still enter their body but, because the silk would not break, the arrow's barbs could not do their work and the arrow could easily be removed leaving a relatively clean wound considering normal arrow wounds.