Since no one want to comment I have made this build and it is working quite nice (on 0/8 - or now that is -1/8 since I have level shift). Only without cardiac it would be endurance heavy. 
"If you want to win you must not lose."
"Easiest way to turn defeat into a victory is to put on the enemy's uniform"
"Better strategic retreat than dishonorable defeat"
- Il Numero Uno (The Number One)
I'm at work and don't have mids so I'll look at it again when I get home.
Right off the bat though, I'd change the way radiant aura is slotted. I don't like the Num+/+ proc in a click because you only get the benfit for 2 min after you last use the power. I know on my fire/rad i'm not spamming my heal most of the time. I know your going for the range def bonus, but I'd still move that around.
Mine is at ~40% to S/L and almost as much Ranged and the -tohit toggle makes up way more than that ~5% to soft cap.
Since my fire/rad had reached highest level of alpha incarnate (endurance one) it is time to slot her. Don't have much experience with making build myself so I would need your comments.
Code:
I was going for range softcap and this is the best I've got. Have merits and some money - but would like to skip purples unless they are cheap ones.
Thanks in advance.
Villain Plan by Mids' Villain Designer 1,92
http://www.cohplanner.com/
Click this DataLink to open the build!
Level 50 Natural Corruptor
Primary Power Set: Fire Blast
Secondary Power Set: Radiation Emission
Power Pool: Leaping
Power Pool: Fighting
Power Pool: Speed
Power Pool: Leadership
Ancillary Pool: Mu Mastery
Villain Profile:
Level 1: Fire Blast -- Thundr-Acc/Dmg(A), Thundr-Dmg/EndRdx(3), Thundr-Dmg/Rchg(3), Thundr-Acc/Dmg/Rchg(5), Thundr-Acc/Dmg/EndRdx(5), Thundr-Dmg/EndRdx/Rchg(7)
Level 1: Radiant Aura -- Numna-Heal/EndRdx(A), Numna-EndRdx/Rchg(7), Numna-Heal/Rchg(9), Numna-Heal/EndRdx/Rchg(9), Numna-Heal(11), Numna-Regen/Rcvry+(11)
Level 2: Fire Ball -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(13), Posi-Dmg/Rchg(13), Posi-Dmg/Rng(15), Posi-Acc/Dmg/EndRdx(15)
Level 4: Accelerate Metabolism -- Efficacy-EndMod(A), Efficacy-EndMod/Rchg(17), Efficacy-EndMod/Acc/Rchg(17), Efficacy-Acc/Rchg(19)
Level 6: Radiation Infection -- DarkWD-ToHitdeb/Rchg/EndRdx(A), DarkWD-Rchg/EndRdx(42), DarkWD-ToHitDeb/EndRdx(43), DarkWD-Slow%(43)
Level 8: Combat Jumping -- DefBuff-I(A), LkGmblr-Rchg+(21)
Level 10: Enervating Field -- EndRdx-I(A), EndRdx-I(19)
Level 12: Aim -- RechRdx-I(A)
Level 14: Super Jump -- Jump-I(A)
Level 16: Rain of Fire -- Posi-Acc/Dmg(A), Posi-Acc/Dmg/EndRdx(21), Posi-Dmg/EndRdx(23), Posi-Dmg/Rchg(23), Posi-Dmg/Rng(25)
Level 18: Blaze -- Thundr-Acc/Dmg(A), Thundr-Dmg/EndRdx/Rchg(25), Thundr-Dmg/EndRdx(27), Thundr-Dmg/Rchg(27), Thundr-Acc/Dmg/Rchg(29), Thundr-Acc/Dmg/EndRdx(29)
Level 20: Mutation -- RechRdx-I(A)
Level 22: Lingering Radiation -- P'ngTtl-Acc/Slow(A), P'ngTtl-Dmg/Slow(31), P'ngTtl-Acc/EndRdx(33), P'ngTtl-Rng/Slow(33), P'ngTtl-EndRdx/Rchg/Slow(33), P'ngTtl--Rchg%(34)
Level 24: Acrobatics -- EndRdx-I(A)
Level 26: Boxing -- Acc-I(A)
Level 28: Tough -- RctvArm-ResDam/Rchg(A), RctvArm-ResDam(31), RctvArm-ResDam/EndRdx(34)
Level 30: Weave -- RedFtn-Def/EndRdx(A), RedFtn-Def/Rchg(31), RedFtn-EndRdx/Rchg(36), RedFtn-Def/EndRdx/Rchg(36), RedFtn-Def(36), RedFtn-EndRdx(37)
Level 32: Flares -- Thundr-Acc/Dmg(A), Thundr-Dmg/EndRdx/Rchg(34), Thundr-Dmg/EndRdx(37), Thundr-Dmg/Rchg(37), Thundr-Acc/Dmg/Rchg(39), Thundr-Acc/Dmg/EndRdx(39)
Level 35: Hasten -- RechRdx-I(A), RechRdx-I(39), RechRdx-I(43)
Level 38: EM Pulse -- Lock-Acc/Hold(A), Lock-Acc/Rchg(40), Lock-Rchg/Hold(40), Lock-Acc/EndRdx/Rchg/Hold(40), Lock-EndRdx/Rchg/Hold(42), Lock-%Hold(42)
Level 41: Maneuvers -- RedFtn-Def/EndRdx(A), RedFtn-Def/Rchg(46), RedFtn-EndRdx/Rchg(46), RedFtn-Def/EndRdx/Rchg(46), RedFtn-Def(48), RedFtn-EndRdx(48)
Level 44: Charged Armor -- RctvArm-ResDam/Rchg(A), RctvArm-ResDam(45), RctvArm-ResDam/EndRdx(45), S'fstPrt-ResDam/Def+(45)
Level 47: Power Sink -- Efficacy-EndMod/Rchg(A), Efficacy-EndMod/Acc/Rchg(50), Efficacy-Acc/Rchg(50)
Level 49: Assault -- EndRdx-I(A)
------------
Level 1: Brawl -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 2: Rest -- Empty(A)
Level 1: Scourge
Level 4: Ninja Run
Level 2: Swift -- Empty(A)
Level 2: Hurdle -- Empty(A)
Level 2: Health -- Heal-I(A)
Level 2: Stamina -- Efficacy-EndMod/Rchg(A), Efficacy-EndMod(48), Efficacy-EndMod/EndRdx(50)
"If you want to win you must not lose."
"Easiest way to turn defeat into a victory is to put on the enemy's uniform"
"Better strategic retreat than dishonorable defeat"