[@Hekazu] It sounds fine. However, it will be limited in the size of things that can be affected (though weaker materials can be affected across a larger area), and in that it can't be used on living matter (since, if it could, it would be inherently better than the bonebreaker discipline). Some items, such as a necromancer's power source, will also be especially hard to break, due to the magic within them.

[s]Anyway an elemental could defend against it using air to deflect flying shards. Wouldn't be able to prevent it from breaking the object, though.[/s]