do you want to use axe, sword, or hammer? Hammer is the best way to for KD. Shove is a good war elite that you can use for KD too. As far as the Ele, most people use Shock to KD but it causes exhausion.
I highly recomend Making a Kd/As.
Thats a classic.
Or you could just copycat everyone else and make a shock warrior.
Go to google and type Kd/As. Or Knock Down aftershock.
I had good times with this build.