D&D 5E (2024) WotC Should Make 5.5E Specific Setting

[Corinnguard]

The Eberron setting also has another thing that sets it apart from other setting. Manifest Zones. From the Eberron Wiki:

Manifest zones are certain locations on the world of Eberron that share a particularly close connection with one of the thirteen planes that orbit Eberron within the astral sea. Within a manifest zone, the area takes on properties of that plane; for instance, a manifest zone on Eberron with a link to the plane of Risia, the Plain of Ice, may make the area much colder than under normal circumstances. Manifest zones might also allow passage between one plane and the next; though for some zones this may only be a one-way trip.

The city of Sharn is actually found in a manifest zone that connects Eberron to Syrania (the setting's equivalent to the Elemental Plane of Air). This is what allows parts of the city to either float in the air or stretch up into the air like a skyscraper in RL.

 

[Paul Farquhar]

Back in 3e, the waxing and waning of Eberron's 13 moons heightened or diminished whatever magic each moon was associated with

Krynn did this first, but for most tables such detailed date tracking is impractical. It was dropped (unless you really want to track it) for reasons of fun, not game rules.

Manifest Zones are setting details, rather than something that affects how spellcasting rules work.

Dragonshards do modify rules in a minor way, in that they can substitute for spell components. They kind of affect crafting, but the 5e rules are pretty loose with regards to crafting materials.