The Knockback Update! Works on stick, bone, fencepost, blaze rod, cobble wall, nether fence and feather in that order.
Blaze rod also sets victim on fire. Feather is half the strength of Stick unless double powered in which case it is hyper-powered, twice cobble wall and more than nether fence.
I cannot make the victim fly up and get airtime no matter what I try. No velocity setting for Y seems to do this, so I'm sending it as is. It does work, I was just looking for the 'power' to increasingly get airtime. Looks like we can use 'weapon' as a parameter and it will scale, it just doesn't apply to velocity UP for some reason.