What is the threshold guardians mean?

Threshold guardians are characters or forces in a narrative that test the hero's resolve and readiness to embark on their journey. They often appear at critical junctures, presenting obstacles or challenges that the hero must overcome to prove their worthiness. These guardians can take various forms, including mentors, antagonists, or literal barriers, and serve to highlight the hero's growth and development. Ultimately, they play a crucial role in the hero's transformation and the progression of the story.