Magic in the MGLN universe is basically complex mathematics coupled with super advanced technology, while still having some anomalies and mysteries here and there.
As a starter, there's Raising Heart, Nanoha's device. Unique that it is the only device shown whose origins are not known, she (because she's voiced by a female) has displayed various capabilities unique to other devices of her kind (having "qualifications", independent movement, training simulations). It makes one wonder what it really is.
Edit: Thanks for S.T.G (or Sunder, if you prefer that) for pointing out the misspelling.
As a starter, there's Raising Heart, Nanoha's device. Unique that it is the only device shown whose origins are not known, she (because she's voiced by a female) has displayed various capabilities unique to other devices of her kind (having "qualifications", independent movement, training simulations). It makes one wonder what it really is.
Edit: Thanks for S.T.G (or Sunder, if you prefer that) for pointing out the misspelling.