Demon Captain is a ferocious battle-born devil and is capable of insane damage and is also very versatile. Disarming his axes and swords will not do any good; this beast can attack with its shoulder-spikes or wrist-mounted blade - and it's not a tiny thing known from Assassin's Creed, either! Backside of the Captain is also armored to resemble a frightening face - but maybe attacking from behind is the way to go? Demonic sentients can use magic as well as armor and weaponry.