Slogra and Gaibon
These enemies are a double boss fight. This boss apperance has only been seen in symphony of the night. But, in many other castlevania games such as "dawn of sorrow" where the appear as two regular enemies. As a boss, they attack in a chain. As in the slogra will stab it's spear as the gaibon will fire fireballs at you. As you strike the gaibon, as it's life has been depleted to a certain amount he become furious and instead of fireballs will attack with a flamethrower-like breath.