The relevant puzzle answers are the following:
Each of these words is an anagram of the name of one of the members of the Fellowship of the Ring, with one letter changed. Extract the letter from the character's name that does not appear in the puzzle answer:
FLOOD -> FRODO :: L -> R DIORAMIC -> MERIADOC :: I -> E PRERINSE -> PEREGRIN :: S -> G WEBISMS -> SAMWISE :: B -> A GOALIES -> LEGOLAS :: E -> L GRANOLA -> ARAGORN :: L -> R BARROOM -> BOROMIR :: A -> I FLAG DAY -> GANDALF :: Y -> N ILIUM -> GIMLI :: U -> G
LISBELAYU is not the metapuzzle answer. REGAL RING is.