Thorough and interesting treatment of the material. Solid tips on fighting and controlling fires. It would be nice to see some examples of how this knowledge could be applied to common RPG scenarios, like fireballs, burning rooms, molotov cocktails/flaming flasks of oil, lava, etc.
The spells in the final chapter are pretty cool and some of them are very unique. It would be interesting to see a similar treatment of weapons and items, even firefighting or preventative items.