There's something lurking in the Trial Chambers...

Among Minecraft's generated structure, the Trial Chambers are far more interesting than they initially appear. What are these places? This video has a piece of music called Trials of the Unknown, which is a concert band piece playable by a solid high school band. Check out the full piece below!    • Trials of the Unknown (Official Score Foll...   Other music in the video written by RGN: "Trials of the Unknown" -    • Trials of the Unknown (Official Score Foll...   "Unknown Enigma" -    • "Unknown Enigma" - Music by RetroGamingNow   "The Depths" -    • "The Depths" - Music by RetroGamingNow   "The Watcher" -    • "The Watcher" - Music by RetroGamingNow   "Totem of Undying" Music not written by RGN: "Ancestry" - Lena Raine