his head has 402 damage according to the bestiary, but he is easy to cheese. use a Daedelus stormbow or a weapon that has a projectile that comes from the sky or similar, like a starfury, (which is bad for the time you fight him) or a Nimbus rod. he has no defense, so if you have a weapon that does 60 damage, it deals 60 damage, instead of 20 for example