Shards of Urrrrgh
I had the boss icon in sight the other day and I was just too tired to go on..
Rragar's Menagerie was pretty annoying as well, did that with hubby and 6 heroes and we made it, but it seemed to take forever.
Oh and A.net will you please stop giving my husband Onyx Gemstones in the hidden treasures while I keep getting lumbered with paltry amounts of gold... I kid you not, it happens at least once per dungeon.