User blog comment:Dewven/Hard Hardmode/@comment-5433432-20130607184622

As was listed below, I highly advise using the hellstone trick against all of the bosses, as I have found it makes taking them down beyond easy. All you need is a decent sized platform of hellstone brick (about 30 pieces should do), a grappling hook of any kind, a decent amount of health potions, and a weapon of choice for each boss. Make the platform out of the hellstone bricks, attach yourself to it with the grappling hook(I say to sue a grapplnig hook because it frees up the item slot the cobalt shield may have taken.), and then summon the boss. So long as you have decent armour(adamantite is best, maybe lesser with ironskin potions), you can sit in one spot, and take 1 bit of damage instead of larger amounts from the bosses. A cross necklace really helps here to prolong the need of health potions. I have used this to farm the hardmode bosses multiple times per night, without the need to sacrifice any greater health potions at all, and so completely vouch for it's usefullness.