if you gear is good and if you can solo
then go solo, you'll find better and higher lvl drops

from lvl~40-50 , drops get good ( you start dropping nice muteables )
otherwise, lvl more and when you're lvl60+ , look for NO-MAZE catacombs with people and share drops

transmutatio box is called muting ^^ you need 2 items of same lvl and same typ, you mix them and you get ONE item with new stats ^^
if you're lucky, the stats may be good

well of evil is always hard ^^ but it is easier to well with a mage
