Lancelot

In Fate/Zero, he is Matou Kariya's Berserker-class Servant in the Fourth Holy Grail War. His identity is Lancelot of the Lake, formerly known simply as the Black Knight. He can turn objects he chooses into Noble Phantasms, and his known sword is Arondight. His love for Artoria's queen contributes to his downfall, and in despair he becomes a Berserker-class Heroic Spirit.