Normally, at low temperature, substances become brittle.
So I hope freeze spell can make structures take more damage.
The percentage do not have to be too large, e.g.
level 1: 30%
level 3: 36%
level 5: 42%
In my opinion, it will be a good addition because it freeze spell disable buildings. Troops can destroy frozen buildings faster. The moment and position of the freeze spell thrown will have to be more precise.

