Team 4 of Series 3 picked up a labelled jar of this substance in the
Level 3 clue room. (Not to be confused with the
moondust used by
Team 1 of Series 6.)
The
team tried sprinkling the stardust in the
stained glass window room to
reveal which path was safe,
but nothing happened. Unfortunately they had entered
losing status by failing a
gargoyle's riddle, and did not have the required
spell [see
SUN,
DARK].
Dungeoneer Leo then fell to his death after choosing the wrong path.
Had his quest not ended at this point, it is unknown what the stardust would have been needed for. However, Leo had already completed many Level 3 challenges and collected all three parts of the
Chalice - indeed,
Treguard said he had "fallen at the last hurdle". It therefore seems plausible that he might have arrived at the final 'space' scene (as did the winning teams of
Series 2) and thrown the stardust to make the quest object materialise. This theory is supported by
Mogdred's earlier remarks, that the
clue objects were useless and they could only win by casting his
GLORY spell - surely a
trick they would have had to recognise.