Vermillion rood.

"I don't think you would want to do that…" Mason displayed the amulet hanging on his neck. "You see the only reason you were able to defeat them was that they underestimated your soul flames and hadn't made the necessary preparations, but with this, you are as good as a puny hero." Mason burst into a sinister laugh.

Soul flames are hard to deal with and dreaded by many because they ignored physical defenses and go straight for the soul, but once they were up against soul-protecting items soul flames would be weaker than basic flames.

"Haha, I always knew you were a retard but I never knew you had no brains, to begin with." Tears rolled down Taliesin's cheeks as he couldn't stop laughing. "Don't you think that the demigods that I burnt to ashes didn't have any form of soul protection?"