In the script, Einon succeeds in raping Kara, after which she claws herself, scraping her hands down her body to remove Einon's touch from her before collapsing on his bed and crying her eyes out. The novelization takes it a step further with Kara removing her dagger from the bedpost and turning it on herself, contemplating suicide, before throwing it away.
Aislinn and Kara's conversation in the novelization and an early screenplay, during which Aislinn details her unfortunate circumstances to Kara and even reveals that she considered smothering Einon as a baby.
Bowen fights the adult Einon, and the king clarifies he never believed in the Old Code and was only "vomiting out the words" to gain Bowen's trust and learn how to fight. You can see the heartbreak in Bowen to realize this and how the dragon's heart did nothing to corrupt Einon, the boy was always going to be a tyrant. Followed by Bowen realizing he hunted a species to near-extinction for nothing, and the guilt overwhelming.
Also doubles as a Nightmare Fuel from Bowen's perspective: here is a boy he tried his best to raise to be an honorable and kindly king, and he reveals himself to be a monster through and through. It just goes to show, a sociopath can come from anywhere...
Aislinn's last conversation with Draco and her life in general. Her people were friends of and venerated the dragons. She gets forced into marriage with a cruel husband that destroys her people's culture, and even with her husband dead, her son turns out far worse. She ends up getting murdered by her son.
In an early script for the film and the novelization, Draco says, "Einon will not fall in my lifetime," to Kara in passing, and she repeats it to Bowen after Einon captures Draco. Draco drops an early hint about his fate, and the humans don't realize the gravity of his words until late in the story.
Not only does Draco—the world's last dragon—die, but his best friend kills him at his request. A few scenes earlier, Draco mentions how he finally has everything he's ever needed.
The way Bowen desperately tries to find a way to convince Draco that he doesn’t need to die for Einon to be stopped only for Draco, who has already accepted his fate, to remain steadfast in his decision. Bowen's immediate appeal to Draco to survive as the last of his kind is met by Draco's response that his time is over, and when Bowen makes a more personal appeal that he cannot kill his friend, Draco responds thus;
Draco: Then as my friend, strike please!
As Bowen still refuses to kill Draco, Draco attacks Bowen to try and provoke him. The novelization, taking cues from an early screenplay, makes it even more heartwrenching:
Draco: Fight back, dragonslayer! Kill me or I'll kill you! Defend yourself! Pick up the ax!
Kara: No! I will do it, Draco!
After the final strike has been made, Draco’s heart is heard beating slowly as he faintly smiles gratefully at Bowen. Then Draco lays his head down, his eyes close, and his heart stops. An early script makes it sadder as it says that Draco enters his final rest "with the serene peace of a saint," connecting back to his screenplay and novelization moniker of "The Serene One." His body turns into a glowing mist and floats into the sky, joining his brethren in the heaven constellation Bowen named him after. It's topped off with Brother Gilbert's narration revealing that Bowen and Kara led the people of the land into golden years with Draco's star shining brightly for all who knew where to look whenever things became difficult. An early screenplay and the novelization go further with Bowen, Kara, and Gilbert bathing in the glow of Draco's starshine, feeling Draco smiling down on them from heaven as the rebel army celebrates around them.
The music that plays during the scene—the main theme's most emotional version—doesn't hurt either. And the fact you can see it coming once the true nature of the bond between Draco and Einon gets revealed doesn't lessen the impact; in fact, it only heightens it.