The Crown Of The Serpentine King

Me, the Moonlit Knight and king's heir 
I am giving you all my word 
In the face of God, the Father of the World 
and the Three immortal old elders 
I promise on my sword 
and the ancient serpent' soul enchanted in it 
To defend the land of our fathers' 
- an ancient abode and our nation's graveyard 
And if there's such a need to sacrifice my life for them