Original sentence: He is described as a former Lord Commander of the Night's Watch in the novels, which refer to him as a mythical figure known as "Night's King".In Game of Thrones, the Night King stands apart from the White Walkers by his "crown" of pointy, frosty horns
Edited sentence: Not much is known about his characteristics and traits before becoming the Night King, although he was afraid when Leaf plunged the shard of dragonglass into his chest.Since becoming the Night King, he became nothing more than a stoic leader with an ambition to kill anything that gets in his way