Rain of Arrows can still heal things with positive energy. In reaper, this healing greatly outscales the damage of other procs.
Aside from that, this ability is still wildly unimpressive except in its ability to create damage-scrolling lag.
It's also odd that it's essentially a short range personal aura in a ranged destiny.
I think it would function better as either a ranged ability zone ability (like a firewall) or as a close range "oh ****" ability with a slowing proc when it deals damage (more total damage than it does now, and not with 10 types per hit to mitigate the damage-scrolling lag)