(Calamity) How do I beat Infernum Skeletron??

[VGSpyder]

I've buffed out and I'm at max available gear for a summoner, why can't I beat him?

[Elamit2003]

Go melee

[Austin]

Setup an arena that allows your proper movement that way you can avoid his attacks while your summons do all the work, start memorizing his attack patterns so you can dodge them more easily too.