Can the damage from a Momentary Perdo effect be healed?
Yes. A Momentary Perdo spell does its damage and then the magic expires, so there is nothing that would prevent natural healing. A Momentary spell that damages a non-living object would do normal damage that could be repaired. If the spell had some Duration other than Momentary, then the spell would prevent that damage from being healed or repaired while it remained in effect. After the spell wore off, the damage would remain but it could be healed or repaired as normal. That is, the only difference between a Momentary and a non-Momentary Perdo spell is that damage from a non-Momentary Perdo spell can’t be repaired until after the spell ends. There is some confusion arising from older editions, where many Perdo spells were given a Duration category called “Instant” and the text implied in some places that damage from Instant spells could not be naturally healed. The Instant Duration has been eliminated for clarity: Perdo spells that simply do damage in an eye-blink are now categorized
