[Ripe]

Weave Block
lvl:7
casting time:1action
duration:1rd/lvl
This spell gives total immunity to the caster to all Weave based spells from 0lvl to 6thlvl.

8th level Protection from spells give you only +8 to saving throw. So either add XP cost to this spell (minimum 2000 XP, probably 2500 XP) or say that while this spell is in effect your spells cannot afect Weave user. And I presume you ment spells cast by Weave user, not Weave based spells.

Necromantic Shield
lvl:5
casting time:1action
duration:1rd/lvl
This spell stops all schools of magic from opperating on the caster except from Necromancy.Which includes magic items but not artifacts.

Again, 8th level Protection from spells give you only +8 to saving throw, so you can say that this spell give you +5 to saving throws against all spells other than Necromancy spells.

In short I think that both of those spells are too powerfull when compared to existing spells.

Edit: I just remembered something else - according to Faiths & Pantheons Mystra has Magic and Spells under her portfolio, which means that every new spell that is developed somewhere in FR must be approved by Mystra (regardless if that spell uses Weave or Shadow Weave).
Do you think that Mystra would allow Weave Block spell?