The initial question is, "Why four MM's?" & "How's that possible? Won't there be not enough corpses for everyone?"
To the first question I simply say, because it's obscenely fun and will have you cackling like a Bond villian when you get past 30 minions.
To the latter question; what makes this all possible is that the death magic hex [wiki]Malign Intervention[/wiki] allows bone horrors (albiet masterless) to be created upon the death of enemies without exploiting their corpse. Horrors created in this way can be captured via [wiki]Verata's Gaze[/wiki]. This process essentially allows each enemy corpse to be utilized twice gaining two minions from each enemy death.
The truth of this build is that there is only one "true" Minion Master in the sense that we usually know a MM as. There is one Master who acts as the main Minion Animator, using more traditional minion skills ( i.e. [wiki]Animate Bone Fiend[/wiki], [wiki]Animate Vampiric Horror[/wiki]), while the other three Masters bring additional minion support tools such as; [wiki]Blood of the Master[/wiki], [wiki]Heal Area[/wiki], or [wiki]Barbs[/wiki], in addition to controlling additional minions via the afformentioned Malign & Verata's Gaze Method.
The masters, their skills and equipment as well as a description of their role in the team are as follows.
Master of Hordes ~ [N/P]
Description: This master is armed with the majority of the traditional minion creation spells, as such this master will usually reach their minion cap before the others and maintain their minion numbers with much more ease as well. He/she also makes use of paragon shouts for increased damage and battlefield mobility.
Attributes: Death Magic; 12+1+3 Soul Reaping; 10+2 Command; 8
Skills:
[wiki]Animate Flesh Golem[/wiki]{E}
[wiki]Animate Vampiric Horror[/wiki]
[wiki]Animate Bone Fiend[/wiki]
[Optional Slot]
[wiki]"Fall Back!"[/wiki]
[wiki]Leader's Comfort[/wiki]
[wiki]Signet of Lost Souls[/wiki]
[wiki]Resurrection Signet[/wiki]
Skills for the optional slot;
[wiki]"Go for the Eyes!"[/wiki] For a brief minion damage spike
[wiki]Deathly Swarm[/wiki] For aiding in the first few kills
[wiki]Verata's Aura[/wiki] For use in an emergency
Armor: A Bloodstained insignia & Minion Masters, Radiant, or Survivor as you see fit.
Master of Redemption ~ [N/Mo]
Description: The Master of Redemption ensures that minions deaths do more than simply provide the masters with more energy. Using Jagged Bones and Dwayna's Sorrow minions that die on the field are either replaced instantly or provide a heal to the masters' party. Further minion support is provided by several area heals to quickly and painlessly keep minions going. (NOTE: Death Nova has not been included in this build due to it not being a feasable tactic with these numbers of minions; AI will do nothing but cast it & it's nearly impossible for a human to target specific minions with an army this size)
Attributes: Death Magic; 12+1+3 Soul Reaping; 10+2 Healing Prayers; 8
Skills:
[wiki]Malign Intervention[/wiki]
[wiki]Verata's Gaze[/wiki]
[wiki]Jagged Bones[/wiki]{E}
[Optional Slot]
[wiki]Dwayna's Sorrow[/wiki]
[wiki]Healing Ring[/wiki]
[wiki]Heal Area[/wiki]
[wiki]Resurrect[/wiki]
Skills for the optional slot;
[wiki]Animate Shambling Horror[/wiki] Allows this master to more easily build up minion numbers, the long recharge means that this won't grind against the Master of Hordes' animating.
[wiki]Heal Other[/wiki] Useful for areas where more party support is needed (can be used interchangably with the other Healing Prayers skills)
[wiki]Healing Seed[/wiki] Useful for additional minion healing & party support (can be used interchangably with the other Healing Prayers skills)
[wiki]Signet of Lost Souls[/wiki] Gives a better degree of energy management
Armor: Radiant is a must.
Master of Pain ~ [N/Rt]
Description: Along with providing more minions to the army the Master of Pain gives the army a much more deadly offensive punch through the use of curses.
Attributes: Death Magic; 12+1+3 Soul Reaping; 9+1 Curses; 9+2
Skills:
[wiki]Malign Intervention[/wiki]
[wiki]Verata's Gaze[/wiki]
[wiki]Animate Flesh Golem[/wiki]{E}
[wiki]Barbs[/wiki]
[wiki]Mark of Pain[/wiki]
[Optional Slot]
[wiki]Signet of Lost Souls[/wiki]
[wiki]Death Pact Signet[/wiki]
Skills for the optional slot;
[wiki]Awaken the Blood[/wiki] Drop the extra points into Blood Magic for a boost to Barbs and Mark of Pain
[wiki]Taste of Death[/wiki] A potent self heal for greater survivability
[wiki]Parasitic Bond[/wiki] A useful cover hex and self heal
Armor: Focus on defense and survivability, Tormentor's or Survivor make great choices.
Master of Blood ~ [N/D]
Description: The Master of Blood has the somewhat unenviable job of being the one to provide army wide minion healing via Blood of the Master. In order to safely sacrifice for this many minions this master must maintain several potent defensive enchantments at all times. The result of those enchantments is a build capable of spamming Blood of the Master even at hight minion levels.
Attributes: Death Magic; 12+1+3 Soul Reaping; 10+3 Earth Prayers; 8
Skills:
[wiki]Malign Intervention[/wiki]
[wiki]Verata's Gaze[/wiki]
[wiki]Blood of the Master[/wiki]
[wiki]Aura of the Lich[/wiki]{E}
[wiki]Dark Bond[/wiki]
[wiki]Masochism[/wiki]
[wiki]Mystic Regeneration[/wiki]
[wiki]Resurrection Signet[/wiki]
Notes: This role cannot be performed by a hero, the maintaining of Mystic Regeneration & Aura of the Lich is EXTREMELY CRUCIAL. Using Blood of the Master outside of Aura of the Lich can be fatal. Maintaining Masochism while saccing will provide you with very very agreeable energy management.
Armor: Blessed insignias are recommended as you'll always be meeting the requirement.
Use any weapons for these roles that you would normally use for a Minion Master.
To sum things up all of these roles except the Master of Blood can be filled by heroes effectively (some more effectively even).
This team build is designed for sheer minion overkill, the joys of being an evil overlord, and generally having a ton of fun with minions. Works almost anywhere a regular MM would (normal mode and hard mode).
Feel free to leave questions or comments, and have fun!
i felt all powerfull
) the areas I have taken this build into it has well and truley steamrolled everything. It's a bit shakey for the first few kills (which will be gotten largely by the rest of the team) but once it gets going it's got a lot more punch than Sabway imo. That being said, I still take Sabway for many areas where minions are a weaker point (lots of aoe, few corpses, minion stealing foes, etc.). 
