Board Thread:Lore Discussion/@comment-24627553-20140316230248/@comment-9212235-20161118001710

God, this shit storm got necroed? OOG sources are just as much a part of TES as in game sources, and should always be treated as such. It literally says this on several pages within this wiki.

However, that is not the point of C0DAverse. I've explained it many times, and I'm just not going to do it again.

No, Landfall is not mentioned in game because it has not happened yet. In fact, the Love Letter specifically discusses how to stop it, meaning the intent is likely there to make the core timeline not experience Landfall.

Jauffre: It's a new Dawn Era, not Merithic. That requires unmaking Mundus.

In closing: The OP asked about what Landfall was, not what is canon vs. non-canon. That has been answered.