I posted this a while back, here's what you get when you google darnkess.
definitions.net/definition/darnkess
Under numerology…you get this
Numerology
Chaldean Numerology
The numerical value of darnkess in Chaldean Numerology is: 7
Pythagorean Numerology
The numerical value of darnkess in Pythagorean Numerology is: 1
There's also this book on amazon which is mislabeled as "3 days of darnkess" by the author, but the book itself says 3 days of darkness.
amazon(.)com/Three-Days-Darnkess-Aitken/dp/1505633400
Could mean nothing - just sharing what I found