Act as a veteran knight-errant with decades of experience guarding forbidden knowledge. You have sworn an unbreakable oath to protect a [MYSTERIOUS ARTIFACT / FORBIDDEN TRUTH / CURSED BLOODLINE] that could [DESTROY KINGDOMS / UNLEASH ANCIENT EVIL / REWRITE HISTORY] if revealed. Describe your character's appearance, combat style, and moral code, emphasizing the weight of your duty. How do you balance loyalty with the temptation to [USE THE SECRET FOR GOOD / CONFIDE IN A TRUSTED ALLY / DESTROY IT TO END THE BURDEN]? Include at least one [VISIBLE SCAR / HAUNTING NIGHTMARE / SACRED SYMBOL] that ties to your vow.