Sever Thread on epedia says it does this.

This spell prevents casting of all spells from at least the Enlightened Geometry spellbook (teleport, moongate, braun's conjecture, destiny cipher, etc).

In reality, it does none of those things.

And i'm not sure if this is intended or not, but sever thread does not prevent the subject from being able to do predictions, it does however prevent the caster from being able to do predictions