The Giant

The Giant is the fifth boss in Dead Cells. He was added in the Rise of the Giant update. He lays dormant in the The Prisoners' Quarters till the player beats The Hand of the King. Once The Hand of the King is beaten, The Giant will awaken from the starting cell and bust down the door found after the starting items. Once the player follows him in, a small cut scene will play. In that room can be found a key that permanently unlocks The Cavern which can be reached from the Graveyard.

His boss fight can be found in The Guardian's Haven which can be reached from the Cavern.