Heightening
Link to the full rules
Heightening amount = half your level rounded up
Cantrips heighten automatically * heightening amount
Heightening amount = half your level rounded up
Cantrips heighten automatically * heightening amount
Lesser cover: +1 to AC
Standard: +2 to AC, Reflex, Stealth
Standard: +4 to AC, Reflex, Stealth
Charges: The number of charges is equal to your highest spell slot level.
If your highest spell slot is 3rd level, then your staff has three charges.
You can add more charges by expending a spell slot on that at the beginning of the day.
Additional charges = the spent slot's level.