Hamon, Lord of Striking Thunder is a Effect Monster card introduced in YuGiOh - GX as part of the "Sacred Beasts" story arc. Hamon, along with Raviel, Lord of Phantasms and Uria, Lord of Searing Flames, is a "Sacred Beast card" which was sealed underneath Duel Academy by Kagemaru. The monster was sealed behind a barrier called a "Spirit Gate", which is only able to be unlocked through the seven spirit keys after they have been won in a duel. This card, along with the other beasts, is able to absorb the energy of duel spirits to power itself. It is said that if any of these beasts are released from their spirit prison, they will create chaos and darkness which will spread across the earth, enveloping it and destroying everything.