"once in a __", an Extremely Rare Lunar Event
This page is the CodyCross answer for the clue below from Fantasy World , Group 867, Puzzle 5 (Astral Projection).
Question is: "once in a __", an Extremely Rare Lunar Event
and the answer is: BLUEMOON
Word Meaning:
BLUE MOON — (countable) An extra full moon that appears in a subdivision of a year, namely:
Definitions from Wiktionary.