A Tool of Vengeance
In the Tempest , I think that Shakespeare uses the character, Ariel, as a tool of vengeance. Ariel has magic abilities and was enslaved in a tree by Sycorax, but after she died, Prospero released him and made him a servant. He is a loyal subject to Prospero in return for his freedom. Prospero's revenge on the ship of nobles who shipwrecked him was primarily fueled by Ariel's magic. Ariel conjures up the storm and puts men to sleep in order to get into their heads and begin to turn them against each other. Ariel became a tool for Prospero's revenge. Prospero keeps him enslaved for as long as he needs his abilities and then promises to set him free. As a tool of vengeance, Ariel is forced to answer to Prospero as his master and carry out any of his desires. He is a slave to Prospero and will never be treated as an equal even after his freedom.