Area Effect and Wall height

[Prof. Á.]

Hello everyone!

I would like to ask a few question: What is the height of an Area Of Effect attack? Is it semi-circle, with the height in the center equal to the radius, becoming smaller and smaller? Or is it 2 yards everywhere?

Also, how tall is the Wall the wall enhancement gives? And can you put the 3x1 wall block in any shape you want? Also, the wall parts are given per level of AreaOfEffect, or by the Radius it would give?

I have searched everywhere, and couldn't find answers. Thank you in advance. :)