This is a real existed type of daggers called swordbreaker. Its purpose to catch opponent's sword in the teeth so opponent won't be able to use it.
OcclusionRoughnessMetallic type of texture contains OcclusionRoughnessMetallic, Base color and Normal map.
Metallic_rough_AO_normal_base color type of textures contains Metallic,Roughness, AO, Mixed AO, Normal map and Base color".