That pretty much sums up my thoughts on the spell. When it first hit lamannia with the upgraded version, it rocked because of the scaling damage (was almost too strong, but still was relieved to have something else to cast than wall of fire for a change). When it was that strong, extend not working with it was ok. The scaling damage was taken away, and now it completely sucks. Extend not working with the spell is no longer ok.
Against fire resistant mobs, wall of fire still out damages ice storm by a mile, and it lasts twice as long too. What is the point of this spell then other than a buff for mob casters? Please either add scaling damage, throw extend on it (what is the point of extend if spells don't work with it?), or give us a spell actually worth casting. As of now this spell is still as useless as it was before.