There are some very interesting posts on the US forum about not slotting an entire set but just parts.
So if you f.e. slot 2 dam io, a proc for neg. en. dam, 2 acc io and a proc for -res, then the damage is superior or at least equal to a complete set but its cheaper to achieve.
Of course that is only an example, i didnt check if the math on that is correct.
Just to give you an idea. Mid's Villain Designer will give you good and detailed info.
and mybe this link helps, its an interesting discussion on the topic:
http://boards.cityofvillains.com/showfla...part=1&vc=1
However, if you're like me and don't like the idea of Frankensteining your build (sorry if anyone's offended but I think it goes against the intent of IO sets), I'd go with Soulbound Allegiance in your Grave Nights, Sovereign Right in your Lich and Blood Mandate in Zombies & Soul Extraction.
Just remember that the Sovereign Right resistance buff is around you not the pet (has about the same radius as supremacy).
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However, if you're like me and don't like the idea of Frankensteining your build
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Does that mean you like to have complete sets?
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
You'll have to forgive me for this... but as a necromancer surely he won't be too averse to Frankensteining ANYTHING? 
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"Hard pressed on my right. My centre is yielding. Impossible to manoeuvre. Situation excellent. I am attacking." - General Ferdinand Foch
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However, if you're like me and don't like the idea of Frankensteining your build
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Does that mean you like to have complete sets?
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Yes
I find slotting pets with interesting proc IOs makes for more interesting game play, watching for that proc to go off and see how your pet suddenly kicks more behind than usual. Slotting Acc/dmg IOs in 3 slots and fitting the others for fun works out better in most cases I think.
This is especially true for the -def procs such as Achilles Heel and Lady Grey. If your pet does a -def AE attack, even better, having a group -res debuffed makes a huge difference.
For Necro I would most certainly slot achilles heel and lady grey in the death knights and to hit debuff Proc IOs in the Lich.
Another thing to think of is poison, the proc IOs in here make so much sense in weaken and envenom. Now you can spam these two on bosses/EB/AVs and have an effect. Weaken can now also debuff recharge rate with dark watcher and envenom can now -res with achilles heel. Slotting pacing of the turtle in neuro breath makes for a large group of enemies -rech even more as well.
I love proc slotting!
@Boerewors
i have a 50 necxo and i have 3 dmg/acc HO´s in my graves and zombies 3 acc/mez HO´s in my lich and then use the rest for procs.
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However, if you're like me and don't like the idea of Frankensteining your build (sorry if anyone's offended but I think it goes against the intent of IO sets), I'd go with Soulbound Allegiance in your Grave Nights, Sovereign Right in your Lich and Blood Mandate in Zombies & Soul Extraction.
Just remember that the Sovereign Right resistance buff is around you not the pet (has about the same radius as supremacy).
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I have to raise a bit of an issue with that. Set bonuses aren't the only thing that IOs are good for. No, they aren't just a way of using up otherwise free slots - they can let you do infinitely more things with fewer slots.
In my current planned MM build, I am using four IOs to cap my damage and accuracy boosts (92% each) for my pets, while getting a not-really-relevant-but-might-be-handy 40% end discount. DMG/ACC, DMG/ACC/END, DMG/ACC, DMG/ACC/END, all level 50, from two different sets. I may lose out on a set bonus but, really, is it worth two whole slots? It simply gives me so much more freedom.
In my drones and the assault bot I've slotted in all the procs I can get my hands on. As they're robots, they have knockback, and so can take knockback IO procs. The [censored] bot has "Chance for Smashing" and "Chance for Recharge" in it, while the drones have the AoE Resistance bonus and a "Chance for Recharge" proc. The protectors have two common Defense IOs, giving me a 4% buff to the defense granted by protector shields - that's the same as slotted Maneuvers.
Likewise, I've managed to max Defense and Endurance for Scorpion Shield in 4 slots. I haven't bothered using the 'extra' two slots for procs, as I moved them to other powers.
You can apply this approach of using two level 50 sets to max out two attributes in four slots with almost any power. Melee attacks, ranged attacks, AoE attacks, all manner of mezzes, build up, res/def shields, the possibilities are endless! You can save slots in powers where you can, and add them to core powers with Procs. The permutations are staggering.
Necrobond - 50 BS/Inv Scrapper made in I1
Rickar - 50 Bots/FF Mastermind
Anti-Muon - 42 Warshade
Ivory Sicarius - 45 Crab Spider
Aber ja, nat�rlich Hans nass ist, er steht unter einem Wasserfall.
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I have to raise a bit of an issue with that. Set bonuses aren't the only thing that IOs are good for. No, they aren't just a way of using up otherwise free slots - they can let you do infinitely more things with fewer slots.
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Infinitely more things = good. Everyone using exactly the same proc IO's = bad
But then that's just IMO, no-one has to agree with me.
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Infinitely more things = good. Everyone using exactly the same proc IO's = bad
But then that's just IMO, no-one has to agree with me.
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Sadly for many procs and nice IO's u need a infinitive ammount of cash 
50)Sinergy X/(50)Mika.
(50)MaceX/(50)Encore
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There are a hueg [sic] number of procs to choose from for some types. Single-target melee attacks have bags of them, any attack that has more than one set type has tons. And of course you can reassign slots to other powers if you have a slot-starved build - ie, a Warshade.
That said, full one-set slotting has its place. My scrapper uses sets that give Psionic resistance, which means 6-slotting them.
Necrobond - 50 BS/Inv Scrapper made in I1
Rickar - 50 Bots/FF Mastermind
Anti-Muon - 42 Warshade
Ivory Sicarius - 45 Crab Spider
Aber ja, nat�rlich Hans nass ist, er steht unter einem Wasserfall.
i've been rummaging around with these inventions, but i was wondering if anyone could impart some suggestions as to which sets to use,
I'm a Necro poison and currently have Brillian leadership in my grave knights, but i'm not sure what to put in the lich or zombies, any thoughts?