chthonic

/ˈθɑnɪk/
adjective
  1. Relating to the underworld or the dead; dark, mysterious, and often associated with ancient earth spirits.
    • The writer described a chthonic landscape of deep gorges and hidden tombs.
    • The cave had a chthonic atmosphere, with shadows that seemed to move on their own.
    • Chthonic rituals were performed at night to honor the spirits beneath the earth.
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