Air block, next question.

If you like creepypasta story’s, GhepoMC.

What about something similar to the glares intended purpose? It could tell you the light level and if it’s dark enough for hostile mobs to spawn.

Redstone dust. It’s basically a wire in the form of powder.

Is there a way to set it up so it only activates if a item with a specific name is dropped or set it up so only the person who dropped the item is teleported?

Are you having a flashback?

Do you mean things they announced we are most looking forward to or things we hope they add? For the former, it’s the trial chambers and for the latter I think they should add a boss or mini boss in the trial chambers.