Castle mages can perform a basic location spell that shows Jon the rough vicinity of each character's last known location, the areas where they were taken. This is determined by you and the players of those characters.
Jon can visit one of those locations to learn more. He can use whatever means and skills he determines is best to proceed. He may bring additional player characters for help, and may also pass the information openly to others for them to use.
Once you've decided your actions, you can let us know 1. the full details of where he will be going, what he's hoping to find, and who he's focusing on searching for, and 2. which characters are involved in the group (if any) and what he or they will be doing to investigate. Linking a thread will help give us more context so we can write you a suitable response!
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Jon can visit one of those locations to learn more. He can use whatever means and skills he determines is best to proceed. He may bring additional player characters for help, and may also pass the information openly to others for them to use.
Once you've decided your actions, you can let us know 1. the full details of where he will be going, what he's hoping to find, and who he's focusing on searching for, and 2. which characters are involved in the group (if any) and what he or they will be doing to investigate. Linking a thread will help give us more context so we can write you a suitable response!