Managed to down him in two wave runs - most notably in blazing fast time (I believe this completed a challenge for some people in the group - since Light and Dark both finished in similar times.)
I'm trash, sadly - my loadouts aren't great and my itemization is trash simply because I can't invest the time to get there. I was proud of what I accomplished. 😭 I think this wasn't too far after the initial RoN launch too but I might be wrong.