Originally Posted by buta
Supposedly a chance at good equips.
I got myself owned at Sky Tower's hellmode. ;-;
I didn't know about the asteroids and then suddenly LOTSA FLAMES EVERYWHERE
This. Just a higher chance at good equips, nothing more. I got a random Nightshade at the Catacombs, and all we got was a recipe for the family cross, no pinks or oranges.
If it makes you feel any better, Miasma is the toughest of all the three Hell Mode bosses.