Am I correct in assuming that skills/skill upgrades are either found or learned through the story, while bone charms are found in the environment?
I've heard that 'not all skills can be upgraded in one playthrough' and 'only 12 charms can be found per playthrough.' I've also heard that there is a mission/chapter select option to replay past missions. How do these elements work together? Does replaying the Lady Boyle mission offer different bone charms than one would find the first time through, for example?
Finally, how permanent is this progress? Can Corvo continue to be upgraded by replaying missions, or will we need to create new games/profiles from scratch in order to spec his skills differently?
Thanks in advance.