The 25th Journal entry, which explains how the Prince's quest even started and carried on to his descendants.
Today marks the rest of eternity. I never knew what treasure lay in this castle. Just that it would cure the king of his illness. ... Who would have known it would have been the fountain of youth? A myth, which grants one eternal life. As I look down on the body of the king I realize that it is inevitable: children will always answer for their father's sins. I entered this castle a swordsman, a savior... But all I have left is a rogue's legacy. I can feel your anger, but know it was not I who sent your family to ruin. The moment the king set foot within this castle, the royal coffers were emptied by Charon. My family - all families - had lost all hope for a better life. And in my mind's eye, I foresaw only desperation and poverty ravage the country. There was nothing for me to go back to. To my children, and my children's children, here I sit, impassive, immortal, and await thee.
Finally defeating The Prince. After countless deaths in the family line to reach the heart of the castle, you are forced to fight your legendary ancestor, who has access to several spells which he fires multiple examples of at a time. You best him, twice, and are rewarded with... him falling victim to the same death screen you've seen so often.
The Barbarian's Fa Roh Du shout. Although not capable of dealing damage, it pushes all nearby enemies backwards regardless of their size, destroys active enemy projectiles, and even furniture. This ability alone can negate some of the game's difficult Bullet Hell sections.
