Alchemist Magician, Too weak? Too strong? Broken? Options

[Moonstone Spider]

A thought I had for a new magician path.

Alchemists are tool users, magicians who disdain using their own power and instead use that of foci to do their work. An alchemist is a full-magician. There are no aspected magicians. They start with the usual 25 magic points but may use them only to bind foci.

Game Mechanics: An Alchemist may cast any spell or summon any spirit regardless of magical tradition if the alchemist has a focus for that particular spell or spirit type. Alchemists cannot learn conjuring or sorcery and instead use the foci's rating, plus up to the foci's rating in spell pool die for the conjuring or sorcery test. Drain is calculated normally.

Alchemists may use more than one focus to cast a single spell, for instance an alchemist may use a specific spell focus to cast a spell and a spell catagory or expendable focus to add more die to the spell test. Or an alchemist may cast a spell with a spell focus and sustain it with a sustaining focus.

Alchemists never suffer from foci-addiction. They may otherwise take geasa as any other magician may.