Shoutouts go to both 5SecondsOfSwim and jz81802 ! The correct answer for Question 22 (answered by jz81802 ) was Cato Nemoidia. The correct answer for Question 23 (answered by 5SecondsOfSwim ) was:
You shall delve into the endless maze
The dead, the traitor, and the lost one raise,
You shall rise or fall by the Ghost King's hand,
The child of Athena's final stand,
Destroy with a hero's final breath,
And lose a love to a fate worse than death.

The extra credit answer by 5SecondsOfSwim again was Luke Castellan.
(I'm so predictable.)

From Harry Potter and the Sorcerer's Stone, how did Headmaster Albus Dumbledore attempt to protect the Stone from You-Know-Who?