Reaper and Soul Reaping
They work extremely well together. Why wouldn’t they?
If you use/are in shroud a lot… naturally SR will work well together.. the middle trait (5) extends (slows down the passive LF lose while in DS) as well as increase crit chances, unavoidable marks etc etc
RIP City of Heroes
Soul Reaping grant unblockable marks and reduce the decacy of LF while in shroud, that are good things, but the best things are: if you’re a condition damace user you can finally use the Dhuumfire traitline to inflict good burn damage while in shroud OR you can use the Chill trait in Spite to spam vulnerability and then the critical rate granted by the Reaper trait and the SR trait (while in shroud) grant you 105% critical rate totally for free.
Reaper works very well with Soul Reaping – better than any other trait line. I almost never run Reaper without SR.
Here is just one example:
http://gw2skills.net/editor/?vRAQBQxcwizfBwCIVAICMAA-e