Sekiro: Shadows Die Twice isn't exactly Dark Souls with a ninja reskin. For starters, Sekiro's protagonist is a set character, not a customisable avatar as per previous From Software titles. This titular playable character is a ninja sworn to protect a young lord - the ten-year-old boy seen in Sekiro's announcement trailer. There's something special about this boy and his bloodline that makes him a target to outside influences, and a clan called the Ashina send a samurai to capture him. In trying to protect his charge, the ninja hero has his arm cut off and is left for dead, and the young lord is taken. When the hero wakes up, he's got a strange contraption where his arm used to be that From is calling the Shinobi Prosthetic, and it's put there possibly care of the ambiguous character currently referred to as The Sculptor, who does most of the talking in the games's E3 trailer.