The brew list is missing an iron skin potion from this note:
The following words are drafted on a sheet of paper obviously in a hurry:
‘ufaigtui sealed in bottle requires a human n two troll blood mixed a
wooden cup recite ufai runes rewritn w mercury (book’s long may need two
of ’em) also ask human ghost guarding spring abt ufaigtui it can do above
to for fee name ihsamat’