When fighting the 2 minotaurs in the Underdark (which is a disproportionally difficult fight by the way), I noticed I could not hit either of them with Thunderwave or Cleave (the 2H weapon skill). When using the skills, I see the red outlines around the enemy and for Thunderwave the trajectory for the knockback, but simply nothing happens. No damage, no saving throw, no 'miss' animation, it's like I'm casting into thin air. I've tested this multiple times with the same result every time.