A character is praying to God or to other similar deity known to be benevolent and merciful. However, this devotee is praying for malice, begging God to be petty and cruel. (The technical name for this kind of thing is "Imprecatory prayer".)
For example, a Racist Grandma may pray that the good lord get all "niggers" killed, a Heteronormative Crusader may pray that the sweet local gay couple will [...] [tvtropes.org]