No fall damage

It's easy as an archer.

Archer:
press left mousebutton (bow), then jump (in the air)

other classes:
just jump or make a special attack (both mouse buttons) and hope that it works ;o

Or the way us normal people do it, is just keep jumping while you're falling, and you won't take damage :P

Or the most simple is to do left+right mouse button at once. Works with a Blacksmith very well in Gravity Golem War. U hit the golem with 5 hits even 7 if hit properly.