Scarab Knight shouldn't increase in damage with more Magic Dmg. I don't use magic damage gear... because it doesn't help in PvP, and the coefficients are shiiiiiiiit. Slight increase in damage, and changing the dmg debuff to something like Atrophy would be nice.
Void of Madness is gud. I like all the buffs. Some could stand to be buffed. I like how many buffs there is; they should all be equally good though. That way, while there is randomness you don't have to worry about getting the right buff.
Oh forgot to add this: THE REST OF THE PERKS ARE ABSOF*CKINGLUTELY HORSE SH*T