MORDHAU

Ladders are on most, if not all, maps in the game. You won't have trouble finding one. Though, the problem will be both getting someone near one at the other end of it (of course, if boosting, it won't be hard) AND having the correct kind of weapon to be able to use it on the ladder.

Practically, any two-handed weapons are a no. Things like the Fire Bomb, Bow, Cleaver won't work either. There is an easy one available by default (on the Scoundrel class): the Rapier.