Lots pf people like the electric fences power which negates KB but has a fairly small radius.
I use the Black Scorpion web-nade power, which covers a decent area but your bots will sometimes KB critters out of your burn patches.
I find the web-nade keeps most critters in the burn patches "long enough", but opinions vary.
I preferred the Resistance shields Patrons for my bots/ff to cover me when damage slipped through the shields. I also saw no gain from Power Boost so I decided not to go with Black Scorpion.
I didn't feel the -end effect of Mu Mastery was going to amount to much help so I skipped that.
This left me with Leviathan or Soul Mastery which I felt gave similar results but I liked Oppressive Gloom and Nightfall more than Knockout Blow and Bile Spray.
total kick to the gut
This is like having Ra's Al Ghul show up at your birthday party.
Scorpion shield stacks with dispersion bubble, making your mastermind much, much safer. I most always go with scorpion shield on robot masterminds to stack with their little bubble on the mastermind, too.
Triumphant Defenders Forever
Psylenz FF/Psi, ArticQuark Storm/Rad, Symon BarSisyphus Bots/psn, Max VanSydow Thugs/Dk, Cyclone Symon Bots/stm, Blue Loki Ice/Cd, Widow 46526
HelinCarnate:OMG it is so terrible. I have the option to take 3 more powers but no additional slots. Boo F'ing hoo.
Ive got Scorpion on my bots/ff now. I dont really use power boost that often, but I enjoy the def stacking. I really want to try the toon with Mu, to see if the -KB is worth the loss of radius on the immob.
I know it's not much of a help, but I'd try the build both ways, and see which one you like more. You have a second spec (unless it's tied up by your pvp spec, or some other special spec), you could make one Scorpion, one Mu, and compare them. I think that's what I'll do, too. After all, it is personal preference.
"And I swear to effing god, that community is .01% nethergoat-level smart and 99.99% completely fascinating varieties of turd-licking idiots" -Talen Lee
There's always the test server. Copy him over a couple of times and try different builds out.
Doctor Obliteron, my Bots/FF Mastermind, hit 50 shortly after the Tuesday night Rikti Raids on Guardian (my first level 50 villain!) last night. He started out with Scirocco as his patron and I quickly snatched up Charged Armor. Then, somewhere along the way (I think because I thought a mace would look cool) I repec'ed and went with Black Scorpion. I naturally picked up the Scorpion Shield.
Now I'm at 50 and with Issue 17 have a freespec staring me down. I'm wondering if I would be better off with Mu Mastery. I have Def with my bubbles and can pick up extra Resist with Charged Armor. I can also lock down baddies with Electrifying Fences while my Assault Bot rips them (burns them, really) to shreds. Heck, I repec'ed out before trying Electric Shackles but a hold can't be too bad.
Or am I better off with Mace? What do you other MM's think?