Shanks received his iconic three-lined scar across his left eye from Marshall D. Teach, better known as Blackbeard. This happened before Blackbeard acquired the powers of the Yami Yami no Mi (Dark-Dark Fruit) and while he was still a member of Whitebeard's crew. The scar was inflicted during a direct confrontation between Shanks and Blackbeard, which Shanks himself mentioned to Whitebeard in chapter 434 of the manga. The injury was caused by Blackbeard's claw-like weapon, which matches the appearance of Shanks' scar
. This scar symbolizes not only the physical mark Blackbeard left on Shanks but also the dangerous threat Blackbeard posed even before gaining his Devil Fruit powers. Despite this serious injury, Shanks has not sought immediate revenge, indicating a strategic patience in dealing with Blackbeard's chaotic ambition
