This is the 14332nd most frequent German word.
hüllten
"Hüllten" is the past tense of "hüllen," meaning "enveloped" or "wrapped."
The word 'hüllten' here is used to describe the act of wrapping or surrounding something (the mountains) with something else (the clouds).
Die Wolken hüllten die Berge ein.
The clouds enveloped the mountains.
The word 'hüllten' signifies the act of wrapping or covering the bride figuratively with an abstraction (mystery).
Der Schleier hüllte die Braut in Geheimnis.
The veil enveloped the bride in mystery.
The word 'hüllten' is metaphorically representing the covering or surrounding of the street with darkness, adding an eerie mood.