Bleap
A dark legend eh well this is the son of Cú Chulainn, who killed him was his father due to the geass that Cú Chulainn imposed on him at his birth which are too absurd from my point of view his name was Connla, honestly they would get a good one out of him story to this kid after all, basically in his battle with his father he forced him to use gae bolg to kill him eye this kid was 8 to 9 years old and he was humiliating the bloodhound hahaha
Dronacharya who's the Father of Ashwatthama. He's said to be warrior so great that no one either God or Human could defeat him as long as he had a weapon in his hand. Any weapon. Even Arjuna's side had to trick him in throwing down his weapon in war to kill him while he was empty hands. He's Arjuna's teacher btw.