Hey feel free to comment, no problem!
The Plank weapon is indeed something that slipped through the multiple versions of the game (we are working on an updated version). We did fix it in the brazilian version: It should read "when you make an effective attack with this weapon, you may stun your opponent".
As for the description on Veils the wording is poor. When we say attacks, we mean special attacks from monsters like the Capymera, which asks for a Circus test (which is a Veils skill). We've changed the description of Veils in the new version to avoid confusion.