The Regen or Regenerate (再生する, Saisei suru) is a type of beneficial buff most notably gradually heals the unit's HP in a set amount of time.
The effect may inflicted to any party.
Regen gradually restores HP of the unit in a set amount of time. While in effect, it restores approximately 1% of max HP per second. Regen lasts roughly for 1 minute, so it may heal up to 60% of max HP.
Regen is the opposite of Poison. It's possible to have both statuses at the same time, HP recovery or debility is ignored however.