The 鎧通し `armor piercer` or `mail piercer` were one of the traditionally made Japanese swords (nihontō) that were worn by the samurai class as a weapon in feudal Japan. The yoroidōshi is an extra thick tantō (Japanese dagger-like sword) which appeared in the Sengoku period (late Muromachi). The yoroidōshi was made for piercing armour ...
Armor cutting tanto. Also called metazashi.
Armor piercing tanto.