The Blood Fiend was an amalgamation of all the blood that had been spilled on the battlefield over the years that the war had been fought. That was what the Tribe of Blood had been doing deep below ground. They had gathered all the blood and the plane's mana to conjure the Blood Fiend and make sure that it ended the battle with the Tribe of Blood as the final victors.
With the mana of half a plane and the blood of all the fallen combatants, the Blood Fiend's power naturally surpassed the Flesh Golem that had only been made from the remains of a single battle. So, it was understandable that the Blood Fiend had reached the same strength as a transcendent. It still lacked a certain qualitative change to its demonic energy. But the Blood Fiend was undeniably as strong as a mage at the transcendent level due to how much demonic energy it had. There was also how easy it was for the Blood Fiend to use it due to how its body was magic.
