One of the PCs in the adventure Curse of Strahd found a luckblade with one wish remaining. He wants to use that wish to get a staff of the magi, a legendary item (Dungeon Master's Guide 203).
The Player's Handbook on the spell wish (288-9) has guidelines on how to deal with a wish that I won't entirely cite here as they are quite long. However, the guidelines include the following elements:
- "The basic use of [wish] is to duplicate any other spell of 8th level or lower."
- However, "[you] might be able to achieve something beyond the scope of the above examples…. The DM has great latitude in ruling what occurs in such an instance; the greater the wish, the greater the likelihood that something goes wrong."
- And "wishing for a legendary magic item or artifact might instantly transport you to the presence of the item's owner."
I take this to mean that, so far as the Player's Handbook is concerned, the DM can grant the PC's wish.
Here's my question: Other than what is found in the Player's Handbook regarding the spell wish, is there any further official written guidance that should also be taken into consideration to determine if a wish can create a legendary magic item? (Sources can include other 5e texts, Adventurer League guides, pronouncements from Wizards of the Coast officials and designers, and so on.)