Matthew was at level 37. Infused with Unholy Mana, his stats more than doubled. This meant his stats were closer to level 80 with it. However, he was facing a demon king.
He fought alongside Aym against Beleth. He estimated their levels to be over 100. Perhaps over 150. If Vine was as powerful as them, Matthew had no chance to survive.
He decided to sneak in using his Shadow Form skill and hit the Black Rider with his blade coated in unholy flames. A strategy that worked in his favor many times.
Not only his blade didn't pierce the demon king's vital shield, but the holy mana around the temple that kept the demonic mana from Ira away extinguished his flames.
Upon being stabbed, Vine turned around to Matthew bringing his sword down with a roar. Matthew parried the attack, but the electric currents on the incoming blade traveled through his to his arms making them numb and hurting like hell.
