I just tried the Monk silver challenge and something very weird happened.
As I started the challenge I realized I forgot to read the description before hand. Since I saw a few plants with a bunch of cool new attributes (never seen plants before) I felt it could be useful to do so for any hints what was to come. I killed a few plants and suicided on the first enemy i saw that actually dealt damage.
Upon exiting the challenge and trying to restart it I see it is already marked as completed?! I died.. horribly.. on purpose.. at lvl 1. How was that a win?
After this a bunch of messages appear as if I had completed some other quests. I assume I got some gold from completing it (but I didn't, did I? what was the objective?) which triggered the gather 1000 gold quest.. and I assume giving me access to the bank building.