Adrian almost fainted because of the news he heard but he saw that his escort was a player. It could mean that this player must have change the narrative about the Undead King. In the records according to the history books in the game, the undead are entities that hate the living.
The only reason for the creation of undead is a dark god related to life magic. It was said that a dark god cast his twisted life magic to revive the dead. The undead revived using this magic will forever have hatred for the living. Yet, Adrian did not totally believe this as even in this universe life and death was held by two separate gods.