Nadir

In literature
Nadir is the moment when the protagonist reaches their lowest moral point.

IN medicine
Nadir is used to refer to the lowest blood cell count (leukocytes, erythrocytes and platelets) for a given patient over a period of time.
For example, in some patients treated with chemotherapy

have a neutrophil count at nadir one week after the start of treatment due to marrow suppression.

The Nadir
is the intersection of the vertical line passing through the observer, relative to a given observation site, with the celestial sphere not visible to the observer.
Point opposite the Zenith and representing absolute south.

Nadir Shah

Persian ruler
Name of a Jewish tribe (Banu Nadir) that lived in the Hejazi town of Yathrib (later Medina) during the 7th century AD

For me:

he was a companion... he was my hunter’s essence... of that rather special hunt, where difficulties became essential to our bond!
Hunting was something innate in me as it was natural for you; we were one thing, our understanding was perfect, everything led to the challenge of flushing out the wild one...
that animal with all its instincts... and only him! "the wild boar"!
The gunshot; that one, for some time now I would gladly have done without... that one, was the final act... with it the hunt ended...
the hunt is everything that happens before. (I will never pull the trigger again) and you taught me that.
With you I had everything that hunting could give me... I could not have more. "Bye Nadir, you take away my hunter’s essence,
I hope one day to find you again... in a place where... with a gesture, I can rediscover our nature!"...
but this time not to hunt... but only to play bye, big dog!...

When we went hunting.

Nadir drawing by Gabry