Was there important/ vital information in 3x09 "Love in the Time of Dragons" that is required for me to stay in the loop of the show. Or is it just another reset-button episode?

It was neither really. Nothing important happened in my opinion, but it wasnt a "reset" more of a filler ep. Had merlin in his pjs which is always hot lol but little arthur if hes your favorite. You wouldnt miss anything if u skipped it. Dont miss next week though EPIC