Did you ever noticed the AI to destroy a Wall?

[Handel]

I mean the Wall casted by the first spirit?
This seems useless ability but providing the AI never breaks it it may be extremely usefull.

[Keneth]

They break it, and it shatters completely by destroying just one piece, so it's far more useless than the wall of the ice spirit.

[sector24]

Depends on how you use it. If you make an area impassable, they will destroy it. If you place it in such a way that the enemy can get around but it'll waste a turn, they'll usually walk around it. If walking around the wall will take 2+ turns, they'll usually destroy it.

[YENKO]

Something that has a price of zero and can absorb ONE enemy attack no matter how strong(one wasted attack), is tagged as 'useful' in my book

[Keneth]

In my experience, there was not even a single time when I would have to or want to use it, it's not worth wasting your rage box for that turn.

[Metathron]

I have used both walls on occasion, mainly when waiting for Reaper to finish resting.