CrimsnMonkey
Skeletron Prime
The only reason I put Terra Lord last is due to the increased difficulty after defeating him.The bluemagic's mod Abomination is summoned with a Foul Orb in the Underworld, which is made from Bubbles (Duke Fishron drop) Scythes (Pumpking Drop) Icicle (Ice Queen drop) Beetle Husks, and some ectoplasm. The Spirit Of Purity is summoned by killing a bunny in front of an Elemental Purge, which is crafted from Residual Elements (drop from the Abomination) and Void Monolith (12 luminite bars and ancient manipulator). I forgot how to summon the Void Marshall, I think it requires luminite. And i'd put Terra Lord above Yharon, and don't forget the newly-added Spirit Of Chaos from bluemagic!
the crafting recipe is super annoying, give a fallen star to the guide and look for "Ritual Of Endings" or something. I'd put the thing at the bottom or just before Yharon, it's that tough if you don't know what you are doing.
I mean come on? 7.2million hp? That's pushing it just a bit. (Note, he also 1 shots me).
Yes I know the rare modifier increased his hp, but still. Without it, he has 3.6million still.