Shield of Faith

Ranged spell
Daily
Action: 
Quick action to cast
Effect: 

You can cast this spell for power or for broad effect.

Cast for Power: 

One nearby ally gains a +2 bonus to AC this battle.

Cast for Broad Effect: 

Choose up to three nearby creatures (including you); each target gains a +1 bonus to AC this battle.

3rd Level Spell: 
The bonus also applies to PD.
5th Level Spell: 
The bonus increases by +1 while the target is staggered.
7th Level Spell: 
The bonus also applies to MD.
9th Level Spell: 
The bonus when cast for power increases to +4. The bonus when cast for broad effect increases to +2.