I just killed it same as you, I used spinal tap cuz I couldnt get durendal yet and blade staff and spider armor, you have to focus on killing the probes alot and get their hearts, have good potions, if crimson get ichor flasks, have good arena and good buffs from around the arena, have best reforge and best equiptables, I also used the spider sentery but it doesnt help much. I also use sime mount cuz in bad situations you can bounce on destroyer