Tips
For the first phase, he is already aggressive. Be ready to block and parry most of his attacks.
Mikiri counter is very handy for his thrust attacks.
Jump towards him when he throws the fireworks.
For his charged overhead attack, hit him once first so he won't change his attack midway. Utilize the mortal blade special attack.
For the second phase, he will call out his owl. This will add more challenge to the fight. He uses more tricks and he vanishes from time to time.
Look out for the owl. That's where he will land.
Jump during the fire attack from the owl. After that, most of the time he will trigger a thrust attack where you can use your mikiri counter.
Rinse and repeat.
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