How do I defeat the Four Kings in NG+?

This little shit is much harder than I thought it would be even in NG+, I usually manage the fight well until I get surrounded and die with 20% of his life left, does anyone have any tips?

I'm around level 120 Using the Black Knight's Sword+5

I got it guys, thanks to whoever recommended Power Within to me, I really felt the difference in the hits, the strategy of hitting them while they are in the death animation also worked well