He was soon borne away by the waves, and lost in darkness and distance.
The ending image dissolves the Creature into sea and night. The imagery gives him a tragic grandeur without absolution. Grief here is quiet; the fury has burned out. Shelley refuses neat closure—only distance and darkness. The line suggests that some wrongs end not with justice, but with exhaustion. We feel the ache of a story that can’t be set right, only ended.