Here’s a history book as the first example.
Domain of the Undead
by Seugid Morlid, Historian; Retired Adventurer
The eastern wastelands known as Khetar are a dangerous, inhospitable place. Many years ago when I was an adventurous lad, I once stumbled across this majestic, yet deceiving crown of ruins buried in sand. Adventurers beware - once you start to delve into Khetar, there is very little chance of returning.
Khetar is home to many forms of the undead, most of which I have seen personally. One will meet skeletons wandering across its surface. Venture deeper into some of the ruins and you will see stronger, more fearsome beings such as the Wight or Revenant. These undead beings owe their so-called ‘lives’ to the magical aura surrounding the ruins, of which its origin is widely unknown.
Since Khetar was once a great city, exploring its inner underground passages to reveal its secrets will prove rewarding. You may find some ancient relics inside some of the ruins. Although this may sound exciting, you should expect to meet angry guardians of such treasures. Do not expect an easy fight, either.
As a final note and warning, never, ever attempt to initiate combat with the legendary Bone Dragon. Some say it does not even exist, yet others hold that the Dragon itself is the cause of natural disasters. As an experienced historian, I am certain that the Dragon is real, and extremely dangerous. It is able to call upon an ancient, powerful spell that reanimates nearby bones into hordes of skeletons and numerous undead, making it almost impossible to slay. It is rumoured that if the Dragon was slain, the magical aura that surrounds Khetar will be disintegrated in a fiery explosion that could consume all of Krystara. This is merely conjecture, however, and probably does not hold in truth.
In conclusion, Khetar is a place not for the light-hearted or the unprepared. It is a deceptively quiet place, and an unforgiving one too.
If you really are prepared to make the pilgrimage east, then as one adventurer to another, I say, ‘Good Luck’!