I find that Pignius's Burning Taunt makes little sense anymore. Before, he had Bonfire to increase burn damage so it kind of made sense to cause attackers to burn but now, neither he or any other beasts benefit from burning aside from the obvious burn effects. Also, his taunt does nothing to help him survive the oncoming attacks meaning that he's asking to die if/when he taunts. IGOROK is the only other "tank" that taunts that doesn't increase their survivability through healing or defense and at least in IGOROK's case, his defense rune options are more than what Pignius's are (not that most people rune them that way though unless they have to).
I suggest either give his taunt a defense buff like most other taunts do or give him a Provoke attack. As it stands now, I don't use his taunt unless I'm desperate to save someone else and would rather sacrifice Pignius because he will likely die. Alternatively, just give him something else completely and not have him be a tank because his entire 'kit' is catered towards the offensive anyway and makes little sense to have him taunt at all.