There were a few extra pieces of information that made him worry after reading the letter.
First, Jordan wrote that around 200 undead guardians would also go with the zombies. He just got the information after the first letter was sent. So he said sorry for the misinformation.
Second, He wrote the information of the ghoul lord.
[Vesper] (lord)
Race: Ghoul (barbarian)
Level: 38
Third, there was a possibility that the higher-ups of Iron Gate Fortress, Goro would also send 10,000 low-level skeletons to escort the zombies, as he worried that a large troop of orcs, ogres, or beastmen from the North would ambush them.
At the moment Jordan wrote the letter, Vesper was still debating with Goro about the matter. From their quarrel, the shadow knew that there were a few valuable goods that were transported.
