Have you guys been able to make these proc on the big bad plot bosses? Dragons? 

 

On hard? On PotD?

I don't know about weapons, but actual abilities and scrolls can hit even the final boss with paralysis or prone, especially if you use other abilities to give them save penalties.

With the weapons you first need to land a crit and then the effect needs to work. Double dice rolls. But available on your warriors for free no abilities/spells.

 

I was just wondering if anyone who has completed the game has managed to make these work on the big bosses. Would ve been throughly impressed. It would also indicate good balance. All things work.

I definitely bounced that one [boss] with the spark around gleefully. Actually, with two ciphers with L5 abilities you can pretty much one-hit most bosses and challenge creatures.