[@KatherinWinter]
The race in question is a twist on Djinn/genies,

Basically rather than them being traditional mystical creatures with the near god-like ability to grant wishes, they possess a unique form of memory manipulation magic and feed on the memories of others to sustain their powers.

By using the wide-spread belief (one which was started centuries ago by their first king as a way to unite his people) that they can grant wishes as a cover they absorb real memories of the past few days, replace them with fake memories in which their lamp was discovered and the wishes were granted, use the infamous ironic twist of fate at the end of the wishes as an excuse for why the wishes are no longer reality, then walk away scot-free and well-fed.

If that version of Djinn lore is acceptable or you want to know more before deciding, please let me know ASAP.