Finisher /(?)/

Fin·ish·er

Finisher

n.
  1. One who finishes, puts an end to, completes, or perfects; esp. used in the trades, as in hatting, weaving, etc., for the workman who gives a finishing touch to the work, or any part of it, and brings it to perfection.
    O prophet of glad tidings, finisher Of utmost hope!
  2. Something that gives the finishing touch to, or settles, anything. [Colloq.]