RUMBLETiGER
Adventurer
Does the feat allow you to cast higher level spells, or simply cast the spell at a higher caster level?Well, I don't know very well how this meshes with your build, but you could take sanctum spell feat at level 5 or 6. This way in your first level of war weave you could cast 2sd-level spells.
Either way, a Sanctum Spell prepared into the weave at the Wizard's Sanctum, then discharged later, would be really spiffy, if it works that way.