Like for example some Wizard decides to use his retrain and for some weird reason wants to trade in his Arcana for, let's say, Nature....
A few levels later he regrets it and decides to retrain back the way it were.... but wait "Arcana" is not on your list! You can't change it back!
I know this example is a bit extreme, but it could happen... who knows...
A few levels later he regrets it and decides to retrain back the way it were.... but wait "Arcana" is not on your list! You can't change it back!
I know this example is a bit extreme, but it could happen... who knows...