What is Tantalus the God of?

Tantalus was not a god. He was a mortal king. The Gods liked him so they invited him to Olympus. He tried to take Nectar and Ambrosia (God Food) from the Gods and they banished him. Everyone made fun of him, even his own children. He killed his kids and put them in the foods. Tantalus invited the Gods to his palace and have dinner with him. When the Gods realized the kids were in the food, they punished him in the Underworld by making him stand in a river but could never drink and a fruit tree above him but could never eat.