ROOK

The Rook is the key defensive piece in Chess, with its row and file control, it defends the back rank from advancing pawns. The Rook's unique ability to castle, creating a stronghold for the king, requires swift movement that is achieved through the airlift via the heavy-payload castle-drone. *Note that the rook can only utilize its drone's airlift-castle-maneuver if it is its home-turret position. (The resemblance to the elephant pays homage to piece in medieval Indian chess, that was a precursor to the bishop.)