One thing I see is you are using the Commanding Presence aura in your Demon Prince. I would suggest putting in an Impeded Swiftness - Chance for Smashing Damage there instead. ALL the Demon Prince's attacks have a Slow component to them, and they can all cause that chance to go off. It seems to add quite a bit of damage for me.
Thanx! I tried it as you said and it is working pretty well for me. Does impeding proc off of tar patch though, or do I need to figure something out for that last slot?
You guys mind taking a look at my demon/dark build, im not really sure when it comes to mm's, but i want this guy to be a tankermage, anyways heres the build, any help will be welcome 
Villain Plan by Mids' Villain Designer 1.81
http://www.cohplanner.com/
Click this DataLink to open the build!
Level 50 Magic Mastermind
Primary Power Set: Demon Summoning
Secondary Power Set: Dark Miasma
Power Pool: Flight
Power Pool: Speed
Power Pool: Fighting
Power Pool: Presence
Ancillary Pool: Mace Mastery
Villain Profile:
Level 1: Summon Demonlings -- SvgnRt-PetResDam(A), EdctM'r-PetDef(37), BldM'dt-Acc/Dmg/EndRdx(40), BldM'dt-Acc/Dmg(40), BldM'dt-Dmg(40)
Level 1: Twilight Grasp -- Theft-+End%(A), Theft-Acc/EndRdx/Rchg(5), Theft-Heal(7), Theft-Heal/Rchg(7), Theft-Acc/Heal(9), RechRdx-I(9)
Level 2: Tar Patch -- RechRdx-I(A), RechRdx-I(31), RechRdx-I(31)
Level 4: Lash -- Hectmb-Dam%(A), Hectmb-Dmg/EndRdx(25), Hectmb-Dmg/Rchg(27), Hectmb-Acc/Dmg/Rchg(27), Hectmb-Acc/Rchg(31)
Level 6: Darkest Night -- SipInsght-ToHitDeb(A), SipInsght-Acc/ToHitDeb(19), SipInsght-Acc/Rchg(19), SipInsght-ToHitDeb/EndRdx/Rchg(25), SipInsght-Acc/EndRdx/Rchg(33)
Level 8: Enchant Demon -- EndRdx-I(A)
Level 10: Howling Twilight -- Amaze-Stun(A), Amaze-Stun/Rchg(11), Amaze-Acc/Stun/Rchg(11), Amaze-Acc/Rchg(13), Amaze-EndRdx/Stun(13)
Level 12: Summon Demons -- EdctM'r-Acc/Dmg/EndRdx(A), EdctM'r-Acc/Dmg(43), EdctM'r-Dmg/EndRdx(48), EdctM'r-Acc/EndRdx(50), EdctM'r-Dmg(50)
Level 14: Crack Whip -- Ragnrk-Dmg(A), Ragnrk-Dmg/Rchg(15), Ragnrk-Acc/Dmg/Rchg(15), Ragnrk-Acc/Rchg(17), Ragnrk-Dmg/EndRdx(17)
Level 16: Hover -- LkGmblr-Rchg+(A)
Level 18: Hell on Earth -- C'Arms-Acc/Rchg(A), C'Arms-Acc/Dmg/Rchg(33), C'Arms-EndRdx/Dmg/Rchg(33), C'Arms-Acc/Dmg(34), RechRdx-I(34)
Level 20: Fearsome Stare -- Abys-Dam%(A), Abys-Acc/Fear/Rchg(21), Abys-Acc/EndRdx(21), Abys-Acc/Rchg(23), Abys-Fear/Rng(23)
Level 22: Shadow Fall -- LkGmblr-Rchg+(A)
Level 24: Fly -- Zephyr-ResKB(A)
Level 26: Summon Demon Prince -- BldM'dt-Dmg(A), BldM'dt-Acc(43), BldM'dt-Acc/Dmg/EndRdx(43), BldM'dt-Dmg/EndRdx(46), BldM'dt-Acc/EndRdx(48)
Level 28: Hasten -- RechRdx-I(A), RechRdx-I(29), RechRdx-I(29)
Level 30: Boxing -- KntkC'bat-Acc/Dmg(A), KntkC'bat-Dmg/EndRdx(36), KntkC'bat-Dmg/Rchg(37), KntkC'bat-Dmg/EndRdx/Rchg(37)
Level 32: Abyssal Empowerment -- EndRdx-I(A)
Level 35: Tough -- S'fstPrt-ResDam/Def+(A)
Level 38: Dark Servant -- Cloud-%Dam(A), Cloud-Acc/EndRdx/Rchg(39), Cloud-ToHitDeb/EndRdx/Rchg(39), Cloud-Acc/ToHitDeb(39)
Level 41: Web Envelope -- Enf'dOp-Acc/Immob(A), Enf'dOp-Acc/Immob/Rchg(42), Enf'dOp-Acc/Rchg(42), Enf'dOp-Immob/Rng(42)
Level 44: Provoke -- Mocking-Taunt(A), Mocking-Taunt/Rchg(45), Mocking-Taunt/Rchg/Rng(45), Mocking-Acc/Rchg(45), Mocking-Taunt/Rng(46), Mocking-Rchg(46)
Level 47: Scorpion Shield -- LkGmblr-Rchg+(A), LkGmblr-Def/EndRdx(48)
Level 49: Weave -- LkGmblr-Rchg+(A), LkGmblr-Def/EndRdx(50)
------------
Level 1: Brawl -- KntkC'bat-Acc/Dmg(A), KntkC'bat-Dmg/EndRdx(34), KntkC'bat-Dmg/Rchg(36), KntkC'bat-Dmg/EndRdx/Rchg(36)
Level 1: Sprint -- Empty(A)
Level 2: Rest -- Empty(A)
Level 1: Supremacy
Level 4: Ninja Run
Level 1: Swift -- Run-I(A)
Level 1: Hurdle -- Jump-I(A)
Level 1: Health -- Mrcl-Rcvry+(A), Numna-Regen/Rcvry+(5)
Level 1: Stamina -- EndMod-I(A), EndMod-I(3), P'Shift-End%(3)
Code:
Thanks Johnny
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Johnnycash-''Morning bright eyes!!''
Mrs johnnycash-''P*****F im sleeping''
Caven that's a really solid and well thought out build! I'm glad to see you grabbed Hasten. Pretty darn practical too, not all filled with enhancements that're impossible to get. I don't see anything wrong with that.... any way you look at it.... darn it!! Now you're making me wanna try another one!!! *sigh*
I mean, personally I'd try to get Tar Patch a little bit faster than that, but.... I.... it's just... the reason... aw heck with it (runs off to roll new toon)
Skyster,
Thank you for the kind words. My MM is only level 38 right now and she is a beast. I havn't played cox since i7 so was unsure about how to do builds now lol. At 50 Tar patch will recharge in 36 seconds and last for 42. So for extended fights (AV's and Heroes) I will be able to double the Tar patch. Btw I have had a couple of AV's and had no problem soloing them. (just took a little while). As to the Enhancements lol up to lvl 38 those are the ones I actually have so i kind of went from there.
Personally, I'd replace the Commanding Presence Taunt/Placate IO with either a Slow set proc or maybe a Damage/Mez Hami-O. 1.25% AoE defense isn't worth bothering with an essentially useless pet aura IO in my opinion.
I'm also a little puzzled at the lack of Fearsome Stare. Not only is it useful mitigation due to the fear, it has a large to-hit debuff. I use it constantly on my own Demons/Dark... I'd highly recommend trying to fit it in once I19 comes out and you get inherent Fitness. You could pull a slot from Hasten and only add about 5 seconds to its downtime, which would let you at least drop in an accuracy and a recharge. Or also drop the Shield Wall: Chance to Blow 3 Billion Inf IO and 3-slot it with a set. 
Cascade, level 50 Blaster (NRG/NRG since before it was cool)
Mechmeister, level 50 Bots / Traps MM
FAR too many non-50 alts to name
[u]Arcs[u]
The Scavenger Hunt: 187076
The Instant Lair Delivery Service: 206636
StrykerX I already replaced the Taunt/Placate IO with the impeding swiftness proc IO. As to Fearsome Stare, I have used it and loved it, but find myself not needing it most of the time once I19 comes out it will definatly become part of my build. I also dropped a brilliant leadership from my demons and put edict of the master pet aura in its place.
This is the build as I have it so far. ANY advice is welcome. One question I do have is does the impeded swiftness proc work on Tar Patch?
Villain Plan by Mids' Villain Designer 1.81
http://www.cohplanner.com/
Click this DataLink to open the build!
Level 50 Magic Mastermind
Primary Power Set: Demon Summoning
Secondary Power Set: Dark Miasma
Power Pool: Flight
Power Pool: Fitness
Power Pool: Leadership
Power Pool: Speed
Ancillary Pool: Soul Mastery
Villain Profile:
Level 1: Summon Demonlings
- (A) Blood Mandate - Accuracy
- (3) Blood Mandate - Accuracy/Damage
- (3) Blood Mandate - Damage/Endurance
- (5) Blood Mandate - Damage
- (5) Blood Mandate - Accuracy/Damage/Endurance
- (7) Blood Mandate - Accuracy/Endurance
Level 1: Twilight Grasp- (A) Numina's Convalescence - Heal
- (7) Numina's Convalescence - +Regeneration/+Recovery
- (9) Dark Watcher's Despair - To Hit Debuff/Recharge
- (9) Dark Watcher's Despair - To Hit Debuff/Endurance
- (11) Dark Watcher's Despair - To Hit Debuff/Recharge/Endurance
- (11) Dark Watcher's Despair - To Hit Debuff
Level 2: Tar Patch- (A) Tempered Readiness - Accuracy/Damage/Slow
- (17) Tempered Readiness - Accuracy/Slow
- (33) Tempered Readiness - Damage/Slow
- (33) Tempered Readiness - Accuracy/Endurance
- (33) Tempered Readiness - Endurance/Recharge/Slow
- (34) Impeded Swiftness - Chance of Damage(Smashing)
Level 4: Darkest Night- (A) Dark Watcher's Despair - To Hit Debuff/Recharge/Endurance
- (50) Dark Watcher's Despair - To Hit Debuff/Endurance
- (50) Dark Watcher's Despair - To Hit Debuff/Recharge
- (50) Dark Watcher's Despair - To Hit Debuff
Level 6: Enchant Demon- (A) Endurance Reduction IO
Level 8: Hover- (A) Luck of the Gambler - Recharge Speed
- (42) Luck of the Gambler - Defense/Endurance/Recharge
Level 10: Swift- (A) Flight Speed IO
Level 12: Summon Demons- (A) Brilliant Leadership - Accuracy/Damage
- (13) Brilliant Leadership - Damage
- (13) Brilliant Leadership - Accuracy/Endurance
- (15) Brilliant Leadership - Accuracy/Damage/Endurance
- (15) Brilliant Leadership - Damage/Endurance
- (17) Endurance Reduction IO
Level 14: Fly- (A) Freebird - FlySpeed
- (42) Freebird - Endurance
Level 16: Shadow Fall- (A) Luck of the Gambler - Recharge Speed
- (19) Luck of the Gambler - Defense/Endurance
- (19) Shield Wall - +Res (Teleportation), +3% Res (All)
- (21) Shield Wall - Defense/Endurance
- (21) Steadfast Protection - Resistance/+Def 3%
- (23) Steadfast Protection - Resistance/Endurance
Level 18: Hell on Earth- (A) Call to Arms - Defense Bonus Aura for Pets
- (23) Call to Arms - Accuracy/Damage
- (25) Call to Arms - Damage/Endurance
- (25) Call to Arms - Accuracy/Damage/Recharge
- (31) Expedient Reinforcement - Resist Bonus Aura for Pets
- (31) Sovereign Right - Resistance Bonus
Level 20: Health- (A) Miracle - Heal/Endurance
- (34) Miracle - Heal
- (34) Miracle - +Recovery
Level 22: Stamina- (A) Efficacy Adaptor - EndMod/Recharge
- (36) Efficacy Adaptor - EndMod
- (36) Efficacy Adaptor - EndMod/Accuracy/Recharge
- (36) Efficacy Adaptor - Accuracy/Recharge
- (37) Efficacy Adaptor - EndMod/Accuracy
- (37) Efficacy Adaptor - EndMod/Endurance
Level 24: Assault- (A) Endurance Reduction IO
Level 26: Summon Demon Prince- (A) Commanding Presence - Accuracy/Damage
- (27) Commanding Presence - Damage/Endurance
- (27) Commanding Presence - Accuracy/Endurance
- (29) Commanding Presence - Accuracy/Damage/Endurance
- (29) Commanding Presence - Taunt/Placate Resist
- (31) Endurance Reduction IO
Level 28: Tactics- (A) Rectified Reticle - To Hit Buff
- (37) Rectified Reticle - To Hit Buff/Recharge
- (40) Rectified Reticle - Increased Perception
Level 30: Hasten- (A) Recharge Reduction IO
- (48) Recharge Reduction IO
- (48) Recharge Reduction IO
Level 32: Abyssal Empowerment- (A) Endurance Reduction IO
Level 35: Maneuvers- (A) Endurance Reduction IO
Level 38: Dark Servant- (A) Cloud Senses - ToHit Debuff
- (39) Cloud Senses - Accuracy/ToHitDebuff
- (39) Cloud Senses - Accuracy/Recharge
- (39) Cloud Senses - ToHit Debuff/Endurance/Recharge
- (40) Cloud Senses - Accuracy/Endurance/Recharge
- (40) Cloud Senses - Chance for Negative Energy Damage
Level 41: Dark Embrace- (A) Gladiator's Armor - TP Protection +3% Def (All)
- (42) Gladiator's Armor - Resistance
- (43) Gladiator's Armor - Resistance/Rech/End
- (43) Gladiator's Armor - End/Resist
- (43) Gladiator's Armor - Recharge/Resist
- (46) Gladiator's Armor - Recharge/Endurance
Level 44: Soul Tentacles- (A) Enfeebled Operation - Accuracy/Recharge
- (45) Enfeebled Operation - Endurance/Immobilize
- (45) Enfeebled Operation - Accuracy/Endurance
- (45) Enfeebled Operation - Immobilize/Range
- (46) Enfeebled Operation - Accuracy/Immobilize/Recharge
- (46) Enfeebled Operation - Accuracy/Immobilize
Level 47: Soul Storm- (A) Apocalypse - Damage
- (48) Apocalypse - Chance of Damage(Negative)
Level 49: Oppressive Gloom- (A) Stupefy - Chance of Knockback
------------Level 1: Brawl
- (A) Empty
Level 1: Sprint- (A) Empty
Level 2: Rest- (A) Empty
Level 1: SupremacyLevel 4: Ninja Run