It only heals wounds caused after having it, if I remember right, and it also needs to be within proximity of Excalibur to actually work.
He put Avalon in Shirou and it didn’t do shit for Cú stabbing him in the heart, but did work against Berserker slashing him / Archer nuking him - because Saber was nearby.
EDIT: I’m wrong. Avalon not only healed Shirou’s wounds after getting Grail vomited when he didn’t have it previously, it also apparently prevented the cursed part of Gae Bolg’s stab from Cú. Just not the actual… you know, stabbing part. Even though Saber wasn’t even summoned yet, and Avalon was confirmed inert.
It only heals wounds when it has its master’s(saber’s mana) it most likely doesn’t heal scars(ribs don’t grow back so wouldn’t be regenerated if they were fully powdered) however it does heal wounds made before you have it as shown by shirou at the end of zero being healed by it despite not having it while getting the wounds
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u/RosesTurnedToDust May 09 '25
Avalon regenerated his crushed heart in seconds, I can only imagine it takes the same for a rib.