Mod: New Nation - The Shogun of the Dark - Rise of the Ninja

[Sombre]

Good question. Generally speaking weapons which are themselves poisons, such as poison spit, ignore armour anyway.

Shuriken and the like use poison secondaryeffect because they are mundane damage from the projectile, poison damage from the coating. Those at least currently deal the secondary poison damage past the shield parry and prot as long as they hit.