Myrrh, Frankincense, and Steel: Kurald Galain's Guide to the Magus

[Kurald Galain]

Well, you'd expect a book called Legacy of Dragons to have some useful things for the Magus, but it turns out not a whole lot.

Balanced Determination is a good defensive trait.
The feat draconic heritage (chromatic) can give a decent boost to damage whenever you have a swift action to spare. This is banned in PFS for no discernible reason.
For the eldritch scion, the feat Draconic manifestation (esoteric) gives you concealment pretty much every combat, which would be great except that the draconic bloodline is pretty weak, and the arcane bloodline gives you the same ability without the feat.
Finally, the spell scales of deflection is good for your defense.

Let me know if I missed something. I'll update the guide in a couple days, also covering the Horror Adventures book.