Starfall Crater

The Starfall Crater does not exist at the start of the game. Once you defeat Starscourge Radahn at the Wailing Dunes, a star that he had been holding in place comes crashing down into eastern Limgrave, leaving a great hole in the ground.

The crater is your way into Nokron, Eternal City, the long-lost city under the Siofra River. There are no enemies and no items in the crater itself, it is simply the door downward.