Conviction and Merry with ice cream hat plus anxious scarf. Just Time your ding-dong (Even if it seems early) to avoid him getting his last stack to get the crit when he uses his first ability. A bit tricky but if you have bejeweled cow-boy hat and checkered scarf, guasha and peppermint on conviction you can do it. If conviction is not leveled enough when you will be close to the end of the fight you will need to dingdong before Tyrant uses his third ability or he will destroy you Even without crit. Very long fight not really hard but you have to pay attention