How does Damaso use his power in a way that propels the novel’s action?

Father Dámaso is an old, power-hungry, and shamelessly corrupt Spanish priest who has lived among the native Filipinos for nearly two decades. In spite of having spent all that time among them, the years have done nothing to endear him or develop any sympathy in him for his “flock.” He is deeply racist, as well as petty and vindictive, and he thinks nothing of using his considerable influence to ruin the lives of those who have slighted him, regardless of how small the offense is. He masterminded the death of Don Rafael Ibarra, then brazenly taunted the younger Ibarra. After he publically insults Ibarra's father, Ibarra attacks him and he excommunicates Ibarra from the church. He is also the godfather (and, in fact, the biological father) of María Clara, giving him influence over her relationship with Ibarra.