Buck Up!

Tactic
Recharge 16+ after battle
Action: 
Quick
Target: 
You and 1d4 nearby allies
Effect: 

Each target gains temporary hit points equal to the average number of hit points it gains when it heals using a recovery.

Champion Feat: 

Add twice your Charisma modifier to the temporary hit points each target gains.

Epic Feat: 

One of the targets can also heal using a recovery.