Devon

“Jason scratched his head. "You named him Festus? You know that in Latin, ‘festus’ means ‘happy’? You want us to ride off to save the world on Happy the Dragon?”
― Rick Riordan, The Lost Hero

“Um...is that thing tame?" Frank said.
The horse whinnied angrily.
"I don't think so," Percy guessed. "He just said, 'I will trample you to death, silly Chinese Canadian baby man'.”
― Rick Riordan, The Son of Neptune

“There!" Mars finished writing and threw the scroll at Octavian. "A prophecy. You can add it to your books, engrave it on the floor, whatever."
Octavian read the scroll. "This says, 'Go to Alaska. Find Thanatos and free him. Come back by sundown on June twenty-fourth or die'."
"Yes," Mars said. "Is that not clear?"
"Well, my lord...usually prophecies are unclear. They're wrapped in riddles. They rhyme, and..."
Mars casually popped another grenade off his belt. "Yes?"
"The prophecy is clear!" Octavian announced. "A quest!”
― Rick Riordan, The Son of Neptune

“Jeez, Hazel," Percy said, "tell your horse to watch his language."
Hazel tried not to laugh. "What did he say?"
"With the cussing removed? He said he can get us to the top."
Frank looked incredulous. "I thought the horse couldn't fly!"
This time Arion whinnied so angrily, even Hazel could guess he was cursing.
"Dude," Percy told the horse, "I've gotten suspended for saying less than that...”
― Rick Riordan, The Son of Neptune