ostiarius (noun)

1. In the novel, the protagonist aspires to become an ostiarius and serve at the entrance of a grand cathedral.

2. The anime series features a character with the role of an ostiarius, guarding the gates of a mystical realm.

3. In the fantasy world, the ostiarius possesses magical powers and is responsible for protecting ancient temples and secret portals.

4. According to ancient mythology, an ostiarius was believed to be a divine figure, entrusted with the task of safeguarding the entrance to the realm of the gods.