Simplify the following text for a Grade 3 native English-speaking person.
Original: Wotan spares Mime , telling him that only `` he who does not know fear '' can reforge Nothung , and leaves Mime 's head forfeit to that person .
Simplified: Wotan tells him the answer : it is the person who does not know fear . He says to Mime that he can keep his head for the moment .