Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

sonic firestorm is the second studio album by english power metal band dragonforce released through on may 11, 2004.
sonic firestorm

the gandaki river is one of the major rivers of nepal.
gandaki river

a patent gives an inventor the right to stop other people making or using their invention.

patent