I've got a 7x perfect gornar flamberge. It's got 5 CER crit, GEF added at DR, and T1. It may actually be T2 ensorcell, but I don't remember, so I am only warranting that it has T1 because of the necrotic haze. If I'm wrong, your gain! No idea on difficulty because I don't care about finding a bard.
30m gets it, someone needs to use this thing. Not interested in $$.