"The Veil" in Destiny 2 Lightfall explained

sportskeeda.com:

Destiny 2 Lightfall has arrived and it brings a new chapter to expand the franchise’s extensive lore. From many mysterious races to intriguing artifacts, nothing raised more questions than The Veil. Its first mention was by Rasputin, and the revelation occurred at the conclusion of Season of the Seraph.

The Veil is regarded as a powerful artifact that is hidden somewhere in the neon-themed city of Neomuna on Neptune.

Rasputin used the term Paracausal to define The Veil. The definition of the word itself means something that alters time and space, thereby affecting the end result.

Note: This article contains major spoilers for Destiny 2 Lightfall. Viewers' discretion is advised.

Players will come across frequent mentions of The Veil in the Destiny 2 Lightfall campaign. It introduces a new nemesis called The Witness, along with Calus, a Cabal elite. The objective is to stop them from uncovering and wielding the powers of The Veil, which is speculated to be on Neomuna.

Its exact nature and power is still unknown, but it is evident that it bears a strong connection to the Traveler. The information conveyed to the guardians at the conclusion of Season of the Seraph was erased by some unknown entity.

This has led many to speculate that The Witness was the one responsible for deleting the information and is aware of the true powers of The Veil.

At the end of Destiny 2 Lightfall, players are able to defeat Calus but The Witness nabs the final win.

The end cutscene shows it etching a huge pyramid on the Traveler and the screen fades to black shortly after. Destiny lore enthusiasts speculate that The Witness was able to harness the power of The Veil.

It is only the beginning of Season of Defiance and perhaps the conclusion of this