You will quickly learn how fast rumors can travel in Hyrule as you play through The Legend of Zelda: Tears of the Kingdom. Not only is everyone trying to figure out what is going on, but they're also grasping at anything they can to help them feel like they understand.
This is no more obvious than when you go through the various quests as part of the Potential Princess Sightings! questline, and when you take on The Beast and the Princess, especially. This quest sees you travel around Hyrule while uncovering a rumor that has gotten a little out of hand.
Updated by Shane Black on June 12th, 2023: Added a link to Potential Princess Sightings! quest guide and the Ousting the Giants quest guide.
How To Start The Beast And The Princess
You will start this quest after agreeing to meet Penn at the various Stables in the game as part of Potential Princess Sightings! quest, and you won't be far off from when you start that quest.
If you head to the New Serenne Stable, which is probably the first Stable you came across in the game, you can speak with Penn there. He will tell you about how there are stories going around of Princess Zelda being spotted riding a fearsome beast. This has many citizens of Hyrule concerned about the Princess, as well as afraid of this fearsome beast. Penn asks you to find out more about it, and with that, the quest begins.
How To Complete The Beast And The Princess
In your conversation with Penn, you will learn that the beast has been spotted somewhere in a southern, tropical location. If you know anything about the map in Tears of the Kingdom, then you'll know that the southern region of Faron is tropical, so start heading that way.
If you don't have a Shrine or Tower unlocked already to travel to, the journey could be long, but it won't be too difficult. You are aiming to find the Lakeside Stable, which can be found along the southern shore, right next to Lake Floria.
When you arrive at the Stable, you will want to head inside to the middle counter and speak with the caretaker of the Stable. He will tell you about a nearby animal sanctuary that has recently opened after the Upheaval, and that should perk your ears a little bit, as it pertains to the story you are chasing.
He also tells you that the sanctuary is right across the ravine from the Stable, so when you're done speaking with him, head outside and look across the ravine right by you. You should be able to see the sanctuary there, and maybe even a creature that looks a little bit like the description of the beast that people have been describing.
Travel across the ravine (be careful about slipping while climbing) and go to speak to the woman in charge of the sanctuary, Cima. She will welcome you and introduce you to the Dondon next to you, a new species of creature that was discovered by Princess Zelda not too long ago. She explains that they are incredibly gentle and sweet creatures, as well.
After you finish speaking with her, Penn will fly in and confirm that the Dondon is most likely the beast that people have been talking about, and their fear has been blown out of proportion. He will thank you for your help, leave, and the quest will come to an end.
Don't forget to speak with Kampo near one of the Stable's entrances to get the Ousting the Giants quest, so you can get some good rewards for taking out the nearby Hinox brothers.