So when the game was Live, the two things I bugged Synapse about were Energy Melee and Mastermind inter-set balance. Since MM's overall were not seen to be under-performers I never made any progress on them outside of Incarnate content. Well here are the ideas I've had in my head for a long time to bring Necro, Mercs, and Ninjas up to the level of Thugs, Bots, and DS. Never used BM, so no idea where that one is.
*NECRO*
This is and easy one and a lightweight one. Lich is fine as a control boss, and Grave Nights are ******* baller, however it's base survivability as a set is low, and zombies are probably the worst T1 minion. Take the Cloak of Fear icon, recolor it Necro colors, and give the following to Zombies on their T2 upgrade:
DEATH RATTLE: Passive - 15' radius -5% tohit, -10% damage, 3% chance to mag2 fear 10s.
Against an even con enemy that would be -12% tohit and -24% damage if all three affect the target.
*NINJAS*
For a Melee pet that has no resists and only defense, them having less defense that Probot buffed bots or Enforcered Thugs is pretty bad. All three ninja types should have their defense upped to 16% (All) at least to match thugs. With no resistances to layer with their defense they should get defense debuff resistance (25% base + 25% per upgrade max 75%)
Jounin should lose the Poisoned dart power, and gain a passive Poisoned Blades power that adds -regen to its existing attacks.
Oni is a hot mess, and needs to lose and replace some powers. Drop the fire sword attacks. Whenever I played my Ninja/Time I noticed the Oni had issues bouncing between the sword attacks and other attacks. Move Fire breath to being a starting power, and char to the T1 upgrade. This would put both control powers on the same upgrade and open a spot on the T2. Give the Oni Incinerate on the T2 upgrade to make the difference on the loss of the two Sword attacks without adding another weapon draw animation to juggle.
Smoke bomb should be infinitely better without poison dart to **** things up, but maybe allow it to accept recharge intensive pet damage sets just to ease some of the burden of slotting.
*MERCS*
Honestly the pets themselves I don't even know. They seem over stuffed with kit they won't use right and may just need to get trimmed up a bit and focused. However I've thought a lot about Serum, and here's what I'd do with Serum if possible.
Make it and enhancement mule. You can stick any enhancement you want on it and that slotting will apply to your target, like a form of super soldier serum. When you use the power, for the duration, it gets the full benefit of the slotting with the kicker that it is unaffected by Enhancement Diversification, similar to Alpha slots. There would be no crash, it would have a constant recharge unaffected by recharge modification, and it could even mule aura IOs.