[SOLVED][PC] Four Kings SL45

Hello. I'm looking for some help with the Four Kings. This is my first run through and I'm trying to use as many NPC summons as possible, which means I will be summoning Beatrice and can only summon 1 player phantom. Sorry if you're normally used to triple teaming these guys.

I already cleared the path from those wooden bridges to the boss, so the walk over should be straight forward. I already died a few times against the boss though, with help and without. If you know a reliable way to take these guys out, please let me know what the game plan is.

Thanks to anyone who bothered looking here. =)

p.s. I know SL45 is a little low but I don't want to level up because I'm terrified of getting invaded by higher level players. I hear people have done SL1 runs through the whole game so I feel like this should be manageable.

Edit: Never mind, I found someone in game to summon and we won. =D
In case that person is an user of this forum, thanks redshadowhero!