I do think that some of the necromancer's core weapons could have some effects tied to minions.
For example ;
Dark Pact could grant all your minions superspeed for 3 seconds.
Mark of Blood could grant all your minions a sizeable life-steal effect for 5 seconds.
Enfeebling Blood could grant a 10 second buff to the minions in the area of effect that makes their attacks inflict bleed.
Unholy feast could grant minions in the area of effect 3 seconds of quickness.
This set of new effects could be a replacement trait for Necromantic Corruption, which I find quite underwhelming in its current form.