There's also a pretty nice view in episdoe 23! Though now I wonder whether they changed the pole material, as it's significantly less dark in ep 23. The blade is the same, though.

It's a very interestingly shaped blade, that is true, even if the precise term might be down to approximation. It is capable of slashing (on one side) and poking, and seems to have a small space between sharpened blade and the mount of the pole where one may try to capture an opponent's polearm, albeit ineffectively.