Dark Melee/Rad Build advice

[Sublime]

Hi! Returnin player that remakes hes Fire/Regen scrapper as DM/Rad brute so i need bit of a help making this build /slotting since im rusty and bad doing this.. 

 

Firstly i wanna try also do duels w this build so as late powers imma want try Makos Bile Spray and Arctic Breath in this build and do another build w GW (Gloom, Soul tentacles) or Energy Mastery powers 

 

Thx in advance!

[Sublime]

Is there any1 that could put some sample build that i could tweak one way or another? 

[Boon]

I have a DM/RAD lvl 22 atm but he is tearing through everythign I have thrown at him.