Flat-Creeper

Flat-creepers  are an abundant plant in the 4th layer and the first thing Delvers see when descending into it.

Description
The 4th layer's name, the Goblets of Giants, originates from the appearance of these plants. They do indeed look like giant chalices, a long thick stem holding up a large concave pad filled with steaming water. Many creatures like the Kazura Squid live in these shallow pools and they make up a part of the Orb Piercers territory. The fully grown cups are filled with hot water in the top, but the ones that are not fully grown produce acid instead.

The name "flat-creeper" actually only applies to the disk-like pad on the top, with the stem itself actually being an entirely different plant, called Kenzan Kazura (剣山カズラ). Every two thousand years, the creepers prey-trapping mechanisms wither up, leaving the ground underneath exposed. With the light obstruction gone, all the plants underneath compete to grow as tall and large as they possibly can, giving rise to a completely new landscape.