Defensive spells and wards are well within my purview. Things that can entrap, signal warning, what have you. I can enchant weapons and armor as well. The world is your oyster, when it comes to magic. The only limitation is your creativity. And, well, I suppose the skill of the magician.

But perhaps it'd be useful to understand what we're working with first. Who has weapons. Who can fight. Best to better equip those who are not equipped already, I think.

Maybe a voluntary census?