Slayer Magic (滅法 (スレイヤーマジック) Metsu Mahō (Sureiyā Majikku) is a sub category of Lost Magic which has numerous forms. It strengthens the user's body to slay the creature that taught them the magic such as Slayer Magic; where the dragon teaches the mage how to magically slay the dragon. While some forms of Slayer Magic like God Slayer and Dragon Slayer have an element taught to the mage such as fire, steel and air etc. Dragon Slayer magic can also be obtained by implanting Dragon Lacrima with a specific element into their body but this cannot be done with any other form of Slayer Magic. People who know this magic can also teach others a form of this magic shown when Hades taught the Flame God Slayer Magic to Zancrow.
Dragon Slayer Magic is a form of slayer magic which is (as the name suggests) taught by dragons and is used to slay dragons. The user can also utilize an element in battle such as fire, ice, steel and air etc.
God Slayer Magic is a form of Slayer Magic which is taught by "gods" but can also be taught by another mage who knows this magic. It is used to slay "gods" like Dragon Slayer is used to slay dragons and it also has elemental styles.