What god helps Odysseus repel the spell that Circe's puts on him?

The god who helps Odysseus repel the spell that Circe puts on him is Hermes. He provides Odysseus with a magical herb called "moly," which protects him from Circe's enchantments and ensures he remains unaffected by her magic. With Hermes' guidance, Odysseus is able to confront Circe and ultimately convince her to help him on his journey home.