It doesn't say anywhere specifically, but it sounds to me like advancement is only possible after an adventure. Sorta like some game systems where you have to pay a someone at a town to 'train' you up a level.No character may advance more than one level due to the
experience points from a single adventure. For example,
Barthal the Thief is 1st level and has 1,000 XP before
going on an adventure; during the adventure, he earns
2,000 more XP (an amazing feat). This would make his
total 3,000 XP, and he would be a 3rd level Thief. This is
not allowed; instead, he advances to 2,499 XP, one short
of the amount required for 3rd level, and starts his next
adventure at 2nd level.
Looking for thoughts on this topic, ideas.. I'm thinking about requiring training.. cost would depend on how generous I plan on being as far as adventure rewards.
Thanks for any advice!