The Flogger is a trap that, canonically, is only available in the map Shi No Numa. It is a rotating wooden trap, with bars and barbed wire holding together two logs, both of which are covered in spikes. It costs 750 points to use, and lasts around 30 seconds. It is very effective at killing Zombies, being an insta-kill on any round. However, it can also easily down the player. It also needs to recharge after each use.
In the map Ginae Bal-Yeol, the Flogger returns and acts identically to it's canon counterpart. The only difference is that it costs 1000 points instead of 750, but it lasts a bit longer and you don't have to wait as long to re-use it.