This is a nice addition.
I haven't tried these in a game though have written a Lore of High Magic that shared some similarities.
Tempest - probably too nasty as a casting value of 5, this was one of the things that made Teclis into a monster.
Iceshard Blizzard - Nasty debuff, I like it.
Walk Between Worlds - I'd honestly remove the to hit modifier from it and give it a range. As it stands you'd basically use it on a dragon mage as a defensive buff but with that change you can use it to protect an armoured target
Storm of Stone - good for trashing war machine crews or hero clusters. I'd increase the range though or make it more reliable as currently it's a bit hard to justify this over an arcane bolt.
Arcane Unforging - This is one we played around with but found it had too many unforeseen consequences. The ability to remove a priests prayers or an Morathi's 3 wound damage restriction was a bit mad.
Light of Battle - The name is already used by the Lore of Light Battlemage but the effect is pretty badass. Could finally make those Swordmasters actually worth their points!
Nice work, dude, and very nice presentation! Can't want to read the next.