Bagpuss said:
You are either poorly informed or deliberately misleading or just confused.
Retraining involves no magical process it just allows you to change minor things about your character, say a feat selection or where you spent skill points, when you level up. But the choice needs to still be legal. So no changing a 1st level feat choice for one that needs BAB +5.
Rebuilding on the other hand lets you change everything about the character from their races, attributes, classes, etc. And does involve a magical alteration process, and most often some sort of quest to find the means for it to occur.
Retraining is a nice idea since it allows characters to integrate stuff from rulebooks that come out after the character was levelled. Unfortunately the rules for it came out in one of the last rulebooks for 3rd Ed, and it requires that you know what you did with choices through every level of your character advancement. Was Combat Expertise your 1st level feat choice or your 3rd? Because depending on that you may or may not be able to swap it for Improved Toughness (for example).
Rebuilding is (imho) a bit on the silly side, but I can see uses for the rules say is some character has a religious experience and wants to start playing a cleric or some such.
Now, this is how it's presented in the PHB 2.
I can understand retraining. I personally know a doctor who went to law school, passed the bar, practiced law for a couple years, then decided he wanted to become a doctor: back to school (med school this time), internship, and now he's a doctor.
That's retraining. But it surely didn't happen over night.
Now D&D is a game and games should be fun, so telling a player "Nope, you're stuck with that feat forever, even though you hate it, because you took it 3 levels ago and now it's a part of you forever" isn't very fun. Well, saying that may be fun for certain DMs who like tormenting their players, but it's no fun for the players.
So let them change basic elements of their character. No big deal. So the fighter specialized in longsword, and now he's just found a super killer battle axe and wants to change his specializiation. Let him.
But, it is a game, and games hould be balanced. We don't want to just let everyone change anything they want, at any time. What about letting the wizard change which spells he prepared right after you tell him what monster they encountered "Oh, it's a red dragon? In that case, I didn't prepare any fireballs this morning, I prepared cold spells instead."
We shouldn't allow players free range to rewrite their characters on the fly, whenever they want to. Their choices should have meaning, and they should feel proud of making the right ones, and they should have to struggle with the challenge of making the wrong ones - at least for a little while.
Which is why the PHB2 allows these changes only when leveling up. And there should be restrictions on how much retraining is allowed, such as only retraining one feat per level-uprather than all of them.
And anything more severe than choosing a feat or spell that you don't like, then it makes sense that you should have to work for the change, i.e. quest for it.
But none of this really needs rules. Put in a paragraph or two about retraining and rebuilding, teach DMS to be fun and fair, to reward good choices but not to overly punish poor choices, and leave it at that.