Area she is the greek goddess of mischief
The name of Greek God is Teos.
Hermes
Hermes.
Eris is the Goddess of mischief.
He is a Greek God.
There is no Norse goddess of mischief, however there is a Norse god of mischief - Loki. It may be the the asker wishes to know the Norse goddess of the underworld - her name, in fact is Hel, and her domain is also known as Hel (one "l" not two).
Apollo is not a Greek goddess; he is a Greek god, born of the Olympian god Zeus and the Titan born goddess Leto.
There wasn't really one villian. Each greek god and goddess had a god or goddess they didn't like personally.
The Greek goddess of hospitality was Hestia. :-)
There is no Greek goddess of medicinal herbs but there is a Greek god of healing and medicine Greek god of medicine is Apollo.
I believe the Greek Goddess's name is Gaia.