My comments...
If the dragon lands on a tile containing an occupied tower, the follower on the tower may feed one of his prisoners
to the dragon to save his own life. The eaten prisoner is then returned to its owner for future use. If the follower on
the tower has no prisoners, he is eaten by the dragon as usual.
I think you need to explain what the following terms mean
* dragon
lands*
occupied tower
* the follower on the tower
may feed (the follower or the player who the follower belongs to?)
*
eaten prisoner
* city points
I don't think the terms in bold are mentioned anywhere in the official rules, and it may be confusing.
Also, how exactly does the following actions happen? Maybe examples are needed.
"The baron is protected from the dragon and towers by his castle, and he extends this protection to his serfs."
What does this mean in game terms? Does that mean the baron cannot be removed by the dragon?
"The baron cannot be seduced by the princess, though his serfs are not safe from her feminine wiles."
OK, again so what does that mean in game terms? Does the princess confer the +1 or does she not???
"A baron on a farm remains on his castle until the end of the game."
How can a baron be on a farm? Isn't a baron a follower in a castle? If a follower is on a farm, isn't that a farmer???
"the follower on the tower may feed one of his prisoners to the dragon to save his own life."
Feed is ambiguous - what does it mean in real actions? Or are you suggesting that the follower can shove a prisoner down the throat of the wooden dragon meeple? And which one of his prisoners? Those that were captured by this specific tower? Or any that was captured by the follower's player?
"he is eaten by the dragon as usual."
I'm still trying to picture the wooden dragon meeple eating another meeple...
Also, what if you aren't playing with P&D? What if you aren't playing with Tower?
"and the player with the majority of serfs receives the other half of the city points."
So If I have no serfs in City A, but 10 serfs in City B, which means I have a majority of serfs, I get half the city points (whatever those are) for City A, eventhough I have no serfs in that city?
"If two or more players tie for majority of serfs, their half of the city points is divided equally among them. If the castle is not occupied by a baron, the serfs become freemen and receive full points."
But if they are tied, do they still receive half?
Also, how does the farm castle interact with Barns???
I think you have quite a bit of rewrite ahead of you...