1. Characters outside of the village can still use Filial magic, yes!
2. The impact of Twila's release will be instantaneous - as in, characters with Twila affinities will notice its return as soon as it's out. However, the return of Twila powers will be as with all other spirits. Twila doesn't know the future Lucetians so their bond doesn't technically exist yet. However, it will be eager to gain access to those who have a bond with it already, so an easier reconnection is possible. Just remember that bonding with Twila has adverse side effects which will be a little stronger with Twila's increase in power now that the barrier is gone.
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2. The impact of Twila's release will be instantaneous - as in, characters with Twila affinities will notice its return as soon as it's out. However, the return of Twila powers will be as with all other spirits. Twila doesn't know the future Lucetians so their bond doesn't technically exist yet. However, it will be eager to gain access to those who have a bond with it already, so an easier reconnection is possible. Just remember that bonding with Twila has adverse side effects which will be a little stronger with Twila's increase in power now that the barrier is gone.