Black Dragon breathes from beneath water?

[reticent]

Don't forget to mention all the dead fish floating to the top of the lake from the sudden drastic dip in pH.

 

[gtoasnt3]

The Draconomicon has an optional rule for black dragons that says they can ignore cover and concealment from opaque water. They also gain a +4 to stealth checks while under the water.

Sounds like your DM used this optional rule. I would.

 

[MarauderX]

The Draconomicon has an optional rule for black dragons that says they can ignore cover and concealment from opaque water. They also gain a +4 to stealth checks while under the water.
Sounds like your DM used this optional rule. I would.

I'm not sure the DM in this case has the Draconomicon. Either way, I have a wizard chasing after the dragon with Icy Grasp in the murky depths. The dragon also has total concealment despite the attack, so we'll probably need to stand at the edge of the water for attacks while it waits for its breath to reset.

Thanks all for your input!