I read the story so far and I'm pretty sure I might and I going to get my answer in the end but I just want to know right now, why didn't the Wish Upon a Star work on the undead?
Sorry about that if you wish to make a complaint please contact to my assistant name milton
Many theories
1) Its not the same wish spell as the one used in the main series. Most of Overlord is inspired on a heavy mix of 3rd edition D&D and MMORPGs favoring MMORGs. The side story has a closer mix of 5th edition D&D and MMORGs favoring D&D. So the spell might not work the way it was explained in volume 3. When Ainz casted it on Shalltear he didn't lose a level's worth of XP because it failed(either that or he only lost his excess XP). In the side story he still lost his XP after casting(of course you could argue that learning 'it was impossible' does count as fulfilling the wish and isn't worth a refund).
2) Supreme Tier magic can't do what World Items can. We learned in volume 3 that World Items beat the Wish spell. In this regards it also makes sense that the Wish spell can't detect the location of World Items. So perhaps when it looked for an answer, it can't even factor in the possibility of finding and using a World Item.
3) It was important for the plot. Sorry to say, but I'm pretty sure Ainz talked about the existence of race changing items that weren't World Items and then later hearing that only a specific World Item could maybe do it; it just sounds like continuity errors. (You could argue that the change from undead to living is not easy and you can't do it without something so powerful.)
My favorite is theory number 2. PS, This entire site is spoiler central.
I just finished reading the part of the light novel bonus special and it says
「我许愿！告诉我让这个都市的居民们恢复原状的方法！」
"I wish, tell me how to get the residents of this city back to their original state!"
So he was more asking a question then asking for them to come back I guess that makes sense?
