Sometimes things just pop in my head. This is one of them. Very useful for a party without a healer.
Party Hit Point Pool - The Party Hit Point Pool is a Hit Point reserve. It can be used to heal HP damage, so long as the character in question hasn't been brought below 0 HP. All PCs in the party have access to the HP Pool, although using the points requires a party consensus. It does not require an action to use, and may be used in conjunction with other actions. PHPP numbers are determined at the beginning of a play session and once the points are used up, there are no more available until the next game session. The number of points in the PHPP resets to full with each game session.
The number of points in the Hit Point Pool is equal to the sum of the PC levels in the party. So, a party consisting of a 3rd level fighter, a 4th level thief and a 2nd level magic-user would have 9 points in their Party Hit Point Pool. Henchmen, retainers and hirelings do not add points to the PHPP, nor can the pool be used to heal them.