Healing
An effect that refers to healing a unitUnitUnits fall under 2 categories: party and enemy. These 2 categories, in relation to one another, are referred to as opposing units. allows it to recover the specified amount of HP chips. A unit cannot heal in excess of its HealthHealthHP chips are stacked underneath an adventurer's chip and removed to indicate how much damage they have taken relative to their Health stat. stat.
When a partyPartyThe party can include both adventurer and companion units. member resolves an effect that heals another party member unit for a number of HP, the unit resolving the effect chooses the amount of HP that is actually healed. This amount may be equal to or less than the number specified by the effect (to a minimum of 0). This is also true for an effect that causes an adventurerAdventurerEach character created by a player is an Adventurer. Each adventurer is a party member. to gain an amount of bonus HPBonus HPBonus HP chips are not added to the stack beneath the adventurer's chip, but instead are placed near their battle form tracker on the adventurer mat..
Does healing pool?
Healing doesn't pool. If you resolve multiple healing abilities back-to-back, sure, take it all together. However, it could be important they don't pool for order of resolution. Say you heal a little, then do something that results in you taking some damage, then you resolve something else that heals you again.
SourceIs how much you healed based on HP gained or the healing given?
If a game effect depends on how much a unit healed, the amount considered is the amount of HP actually gained, not the amount of healing that the healing ability offered.
Source