Few things Carni,
I've made one recently, enticed by the new i13 sets (Accurate healing, and recharge intensive pets)
The proc of RIP is another 10% resistance aura, and that should slot right into fluffy. Worth putting in, I think.
Also, didn't know that the procs went into soul extraction. Is that an aura from the ghost? Isn't that a bit frustrating that you only get the % benefit after one of your zombbeeez is already dead?
Also, with the MM buff changes, do you need any rech in them at all (unless the power's rech changes, I know their end cost has). So, maybe, 1 end red, in each?
I appreciate that you made this a while ago and things may have changed for you 
just spotted it while looking for a 2nd opinion on the combo 
I think the Resistance Auras are mutually exclusive, that if you've the current Pet Damage one you can't slot the recharge one. Not 100% though.
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Also, didn't know that the procs went into soul extraction. Is that an aura from the ghost? Isn't that a bit frustrating that you only get the % benefit after one of your zombbeeez is already dead?
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They aren't PROCs, they're always on, even if the power isn't active, so the The Ghost is a good place to stick them, or is the most "affordable" for me at least, I don't have the slots to spare anywhere else. Thugs MMs can do the same sort of trick using Gang War.
One change I'll almost certainly be aiming for is to get the forthcoming -ToHit Damage PROC into Dark Servant.
I wouldn't have thought they were mutually exclusive (that's the ol' logic there, i've nothing to back that up with), but if you've read that somewhere then fair play.
Great news re: ghosts, shall be doing that myself then. Didn't really want to use 2 of those in the Zombie Horde.
Didn't think about the -tohit dmg proc, will see if I can squeeze that (and the other res proc exclusivity considered) along with some HOs or Frankenslotted IOs.
Given the dual-builds feature of i13 I thought I might make my Necro/Dark a Tankermind for his secondary build. This is more or less what I was going with. I haven't gone mad with IOs because Suckers is a bit buggy and out of date except for in certain cases like in Dark Servant & Lich, where I know ToHit/Recharge IOs are excellent as they boost not only how long the Summon power recharges in, but also how quickly some of the pets powers recharge.
Link to original build
+---------------------------------------------
+ Built with SuckerPunch's Online Planner
+ http://www.cohplanner.com
+---------------------------------------------
Name: Mr Reaver (Tank)
Level: 50
Archetype: Mastermind
Primary: Necromancy
Secondary: Dark Miasma
+---------------------------------------------
01 => Twilight Grasp ==> 2xAcc,3xHeal,1xRech
01 => Zombie Horde ==> 3xAcc,3xDam
02 => Tar Patch ==> 3xRech,1xImpededSwiftness: %Smashing
04 => Darkest Night ==> 2xToHitDeBuff,1xDark Watchers: %Recharge Slow
06 => Enchant Undead ==> 1xRech
08 => Combat Jumping ==> 1xEmpty
10 => Hurdle ==> 1xJump
12 => Grave Knight ==> 2xAcc,3xDam,1xUndermined Def: Rech
14 => Super Jump ==> 1xJump
16 => Health ==> 1xHeal,1xEmpty
18 => Soul Extraction ==> 3xRech,1xAcc,1xSovereignRight: Resist Unique,1xEdictof the Master: Defense Unique
20 => Fearsome Stare ==> 1xNightmare: Acc/Rech/Fear, 1xNightmare: Fear/Range, 1xGlimpse: Acc/Rech/Fear, 1xGlimpse: Fear/Range, 1xGlimpse: Acc/Rech, 1x-ToHit
22 => Stamina ==> 3xEndMod
24 => Shadow Fall ==> 3xDamRes
26 => Lich ==> 1xAcc,1xDampened: ToHit/Rech,1xDampened: ToHit/Rech/End, 1xDark Watchers: ToHit/Rech, 1xDark Watchers: ToHit/Rech/End, 1xFear
28 => Provoke ==> 1xAcc,2xTaunt,2xRech
30 => Petrifying Gaze ==> 1xAcc,3xHold,2xRech
32 => Dark Empowerment ==> 1xRech,1xEndCost
35 => Acrobatics ==> 1xEndCost
38 => Dark Servant ==> 1xAcc,1xHeal,1xDampened: ToHit/Rech,1xDampened: ToHit/Rech/End, 1xDark Watchers: ToHit/Rech, 1xDark Watchers: ToHit/Rech/End
41 => Scorpion Shield ==> 3xDefBuff
44 => Howling Twilight ==> 3xRech,2xDisDur
47 => Life Drain ==> 1xAcc,2xDam,1xHeal
49 => Mace Beam Volley ==> 1xAcc,3xDam
+---------------------------------------------
01 => Sprint ==> 1xEmpty
01 => Brawl ==> 1xEmpty