Not All Treasures Are Silver And Gold 

William watched the Undying Lands until it vanished from his sight.

Malacai had activated its stealth ability, and no one knew where the giant floating island would appear next.

Although William didn't know what Malacai's goal was, one thing was certain, the Dracolich was not his enemy. Malacai had made this perfectly clear to him, and the Half-Elf could tell his sincerity.

Before Malacai left, he said some parting words to William. He told the Half-Elf that if they ever meet in the future, William should pretend that they didn't know each other. 

The red-headed teenager didn't say anything, because there was no need for words. He believed that those who had participated in the war of the Southern Continent would be able to recognize the powerful Undead Army that had made a deep impression in their hearts.

There were many smart people in the world, and it would be fairly easy for them to connect the dots.