finalethos
noun
The sinking feeling of emptiness that settles in after completing a long-term endeavor, like the last episode of a beloved series, where anticipation vanishes and a void of purpose momentarily replaces it.
From Latin 'finis' (end) + Greek 'ethos' (character, spirit), suggesting the spirit that concludes a long journey. Pronounced "fih-NAHL-eh-thos"