[Endoperez]

I though Ice Fortress would be something like your Ice Wall idea, temporary fort that gets destroyed when sieged and/or when it melts. It could get bad with some Earth rituals though.

Very Powerful cursed magical item costing 80 water gems and giving the wielder +1 on any magic path, including those he doesn't have. If it was an armor no-one would be able to wear two of them.

Good ones, IMO, are Water Way, Watery Form, Reflection, propably some others I forgot.

Maybe water should be Random magic? That would link Water and Luck together. I can't really come up with other things than that Robe of the Rainbow, and that is just pure random. Maybe Gandalf could give us some hints?