Dare enter the Volcano of Kronoblaze
Before Earth was swarmed with creatures, Earth was a giant ball of fiery lava, orbiting the ruling sun. The sphere of lava did not have any civilization, apart from the ferocious Kronoblaze. Odin, the king of Asgard ordered that they should send a miniscule planet at Earth so it will transform to a liveable planet and be filled with immortals, but was disappointed to see mere mortals.
Loki, the brother of Thor hated Asgard and wanted to conquer it, so he created a portal in Kronoblaze's Volcano that lead to Asgard. Kronoblaze the one third human, one third dragon and one third kronosaurus was aware of the portal, but waited for Asgardians to come and attack him. Kronoblaze was a jet black and crimson red creature with scorching breath as hot as fire, lightning tipped talons, an indestructible body and colossal jaws. He had a savage nature and left a trail of destruction wherever he went. Although many had tried to slay the vicious brute, none where successful and felt a burning demise.