Swords of Valor
"I, Gromdon Hindalfson swear never to steal from my companions; Warrick, Nartharian, Varanis or Childris. I swear this by the God of Thieves and on my mother’s life. By this blade and this wound (impales hand) so I bind myself to this Blood Oath. Should I breach this oath in word or in spirit may this wound return to me ten-fold."
At that point the wound disappears and leaves a scar.