You have completed every Assassin’s Creed game that has been released so far. You have the costumes. You live and breath the game. Why not brand the insignia of the Assassin Order into your flesh? Seems like the logical next step to me.
This Assassin’s Creed pocket branding iron fits on your bic lighter. Just heat it up and brand yourself like cattle. Okay, really this brand is for marking up things like wood or your notebook, please don't be silly and brand anything living!