Beware of the Graveyard Ghouls/Monstrous plant monsters from a certain Greenhouse

Here is when Princess Yuna and her friends discovered the Graveyard Ghouls and Plant Monsters in Welcome to Horrorland.

At the Golden Oak Library, Celestia was too concern about Luna worrying for Yuna.

Princess Celestia: It's going to be alright, Little sister. Yuna is very brave, And she'd never miss out the ceremony.

Princess Luna: I hope you're right, Sister.

Princess Celestia: ???