post-RED NL build?

Here's what I ultimately ended up doing:

100: Quadruple Throw, Night Lord's Mark, Shadow Shifter, Claw Expert
Got Shadow Shifter to 10, 1 point into Showdown
Maxed Claw Expert
Maxed Night Lord's Mark
Maxed Showdown
Maxed Dark Harmony
Maxed Toxic Venom

I'm moving on to Quadruple Throw and then Frailty Curse along with MW afterwards. It's probably not the most efficient build.