Imagine the psychological power a weapon like that would hold over people at that time. Your leader possessing a dagger forged from light that fell from the heavens would probably inspire a lot of supernatural feelings.
"Tutankhamun's knife was made from meteorite iron"
> The origin is another mystery around Tutankhamen’s blade. In the Amarna Letters, a diplomatic correspondence written on clay tablets and discovered in a royal archive in the south of Egypt, there is a list of gifts sent by King Tushratta of Mitanni in Anatolia, to Pharaoh Amenhotep III, Tutankhamun’s grandfather of Ancient Egypt when he married Princess Tadukhipa, the daughter of Tushratta. Among the gifts mentioned in the list is a dagger with an iron-made blade.
> The research of Arai’s team states that this is very likely to be the same dagger for two main reasons. The first being that iron-processing technology was already common practice at the time in the Mitanni regions. And second, because the dagger’s gold hilt shows a low percentage of calcium with no sulfur. This feature indicates the use of lime plaster as an adhesive material for the decoration of this part of the object, a frequently used material in Mitanni, which was used in Egypt until several centuries later, during the Ptolemaic period.
(I assume they meant 'which was [not] used in Egypt until several centuries later', otherwise that sentence doesn't quite make sense)
> Meteorite falls may have been the source of cultish worship. The cult in the Temple of Artemis at Ephesus, one of the Seven Wonders of the Ancient World, possibly originated with the observation and recovery of a meteorite that was understood by contemporaries to have fallen to the earth from Jupiter, the principal Roman deity.[68] There are reports that a sacred stone was enshrined at the temple that may have been a meteorite.
However, that doesn't mean that the particular knife of Tutankhamun was necessarily known by the Egyptians to have been made from meteoric iron.
Without "knowing". So the power is "accidental" - accidentally in Tut's hands.