I've added two new items to the weapons for shadow priests post:
Both of these drop in heroic magister's terrace, which explains why I haven't come across them in person but doesn't excuse the horrendous oversight. Nice, aren't they?
The mace drops of Kael'thas himself. Given how much trouble it is to get to him, I'd be weary of pinning my hopes too hard on it dropping. In an instance where you're dead weight if you can't crowd control, I doubt I'll be seeing him any time soon.
But the dagger drops off the far more accessibly Selin Fireheart. The competition will be a little stronger, and the reward is a little paler, but it wouldn't be too much trouble to put this boss, the first in Magister's, on farm just for the weapon.