Project Arc

Project Arc (プロジェクト・アーク) is a plan set up by King Drasil where it would use the X-Program to delete 98% of all Digimon.

Digital Monster X-Evolution
The Project Arc is the main plan of, where it put the remaining 2% of the selected Digimon to live in the New Digital World.

Digimon Chronicle X
After kills,  removes the barrier between the old and new Digital Worlds, and Kota Domoto and Yuji Musya promise King Drasil they will try to find a way to expand the capacity of the Digital World so that King Drasil doesn't have to use Project Arc.