In this scene, Caliban offers Stephano and Trinculo earthly, carnal power in return for exacting revenge on Prospero. Caliban tells Stephano that he can become ruler of the island and have the beautiful Miranda for his wife if he will only kill Prospero. Stephano responds by saying:
Monster, I will kill this man. His daughter and I will be king and queen—save our graces!—and Trinculo and thyself shall be viceroys
Caliban presents violence as the sure route to power. He states that all Stephano has to do is drive a nail into Prospero's head or bash in his head in some other way and burn his magic books, and the island will be his.
What is notable is that power, as understood by Caliban and the other men, is completely carnal: it is obtained through violence, and it brings purely worldly rewards, namely, a kingdom and a woman. It is not surprising that this viewpoint comes from Caliban, a "monster," or that the drunken Stephano and Trinculo fall for it. These three characters are tied too strongly to earthly pleasures. In the next scene, Ariel will present a version of power that is much different: one based on sincere repentance for one's misdeeds. This form of power, Ariel will demonstrate, is more potent than violence. The kind of violence Caliban and the others contemplate leads, Ariel notes, to divine punishment, which may be delayed but will doubtless come.