So recently, whily playing Devil Dino, I realized that he has the ability to make a duo attack on clicks with Blades claws fangs. So how does this work with the duo reducing damage by on the the second click? Is it just whatever you roll for blades on your second attack, you subtract by 1?
Duo attack
Give a power action, then give two attack, either close combat or ranged combat, reduce damage by -1 for the second attack. (in a nutshell)
Blades, give a close combat attack action.

Looks like they work together. But what about damage reduced on second attack with blades?

You can use b/c/f with the Duo Attack. B/C/F is a close combat action. The Duo Attack grants two close combat attacks.

A close combat attack is not a close combat action, so unfortunately, you cannot use the two together.

Not quite accurate.

B/C/F is not an action of it's own... rather, it activates when you take a close combat action. This is why it is compatible with other Close Combat actions like Flurry and Exploit Weakness.

As was mentioned, though, Duo Attack is a power action that grants two close combat attacks, and that is why B/C/F does not activate.

Ok thanks for the clarification.