How do I beat Nightmare King Grimm?

[jlim]

best tips to beating this boss? Struggling with this one tbh

 

[vinegar2]

You can usually hit him twice at the end of his flame pillar attack and you can dodge it by just move pause repeat. The fights so fast paced I try to always be moving other than that and I'd recommend using a nail build instead of spells just because its simpler and seems more effective for this fight.