First allow me to preface this by saying that I've been gone for a year or more and I've only recently returned. I'm not sure what changes there've been nor how on par I am. I took Blazing Aura later than I'd like and Burn at 47 once Cone Immob is available. You can go w/ Elec Fences or whatever it's called as well, it may be a better choice. Here's a rough outline of what I would sort of plan for...
Villain Plan by Mids' Villain Designer 1.401
http://www.cohplanner.com/
Level 48 Mutation Brute
Primary Power Set: Dark Melee
Secondary Power Set: Fiery Aura
Power Pool: Fighting
Power Pool: Fitness
Power Pool: Leaping
Power Pool: Speed
Ancillary Pool: Soul Mastery
Villain Profile:
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Level 1: Shadow Punch Empty(A)
Level 1: Fire Shield Empty(A)
Level 2: Shadow Maul Empty(A)
Level 4: Healing Flames Empty(A)
Level 6: Boxing Empty(A)
Level 8: Siphon Life Empty(A)
Level 10: Swift Empty(A)
Level 12: Combat Jumping Empty(A)
Level 14: Super Jump Empty(A)
Level 16: Health Empty(A)
Level 18: Plasma Shield Empty(A)
Level 20: Stamina Empty(A)
Level 22: Dark Consumption Empty(A)
Level 24: Tough Empty(A)
Level 26: Soul Drain Empty(A)
Level 28: Consume Empty(A)
Level 30: Hasten Empty(A)
Level 32: Midnight Grasp Empty(A)
Level 35: Blazing Aura Empty(A)
Level 38: Taunt Empty(A)
Level 41: Soul Tentacles Empty(A)
Level 44: Dark Obliteration Empty(A)
Level 47: Burn Empty(A)
Level 49: Rise of the Phoenix Empty(A)
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Level 1: Brawl Empty(A)
Level 1: Sprint Empty(A)
Level 2: Rest Empty(A)
Level 1: Fury