This guy on early levels (50-60) is even harder than some bosses. So many inconsistences in this game lol. Wish the devs could have invested a little more time improving and expanding the game before abandoning it.
It doesn't do only slash damage, it does blunt when it hits with it's hammer, and when jumping it does both. Basically you want slash defense and blunt defense for this guy, don't get hit every, or stun lock it.
To the guy talking about having jaws of death and the enemy having more HP, while it's quite possible the wiki is wrong, Jaws is also a primarily slash weapon. This enemy resists the hell out of slash, so you do **** for damage.