[Twan]

Darkvision will become useful once maps will be made with (dark) cave provinces, then spells will be needed to grant darkvision.

Eye of the Void is the cheapest +2 penetration item, don't know if anybody already made one for the anti-illusion flavor effect.

Freezing mist is a crosspath spell including a level 3 skill so isn't a common spell. I was thinking about a spell a common elemental mage can cast (say f2 *or* w2).

The last spell is of course another anti-illusion spell and illusions are an air magic thing. As air is near impossible to develop with a non air nation, it's one of the many anti air spells that should exist out of air magic.