I am really going at it with the ideas today but I like sharing what I think.
I like playing Necromancer ALOT and Minion Master is part of that. Here is what I have come up with
New visual minion types.
It always bugged me and I bet alot of necromancers that most of the minions look the same (ie Animate Bone Minion, Animate Bone Horror, Animate Vampiric Horror)
How about this??
1. Animate Bone Minion: Summons two Hellhounds http://gw.gamewikis.org/wiki/Hellhound
2. Animate Vampiric Horror: Would summon a flying Vampire Bat that would basically do the same but look like a large flying bat, could be undead or not
3. Always wanted to be able to command a Smoke Phantom like the Vizier at can in various missions http://gw.gamewikis.org/wiki/Smoke_Phantom

4. Since the arrival of Nightfall I've REALLY been wanting the Necromancer to be able to create/summon and control a Demon creature, you are a necromancer after all, with all the evil magic and stuff?
