Dip the scroll labeled LEP GEX VEN ZEA into the fountain?
Your scroll called light fades.
The first prompt deliberately avoided 'called', 'named', and other
attributes to keep it short, but the discrepancy here is blatant, so
increase the verbosity in order to have the reminder that's included
in the prompt be the same as object name in the followup message.
Bonus fix, noticed while testing it: water_damage() was reporting
the "{blank,unlabeled} scroll fades" even though blank scrolls are
already as faded as they can get. Likewise for blank spellbook.