Proposed Canon
Healing is a way to restore the hits of a damaged Unit during the Healing Unit's Turn. Normally, Units heal at the beginning of their Turn.Erf-b1-p046a. Healing may occur as the result of Healomancy spells and scrollsErf-b1-p123, or a Unit's Natural Ability to heal (eg.Lofty Elves and Altruist Elves)Erf-b1-p022.
Before an act of Retconjuration Twolls had the Natural Ability of regeneration which would imply a certain amount of innate Healomancy that effects the self only. It is unknown if this Natural Ability still exists after the Retconjuration.