YOU SAID:
is the essence of a presence that is feeling bereft
INTO JAPANESE
生き残っていると感じている存在の本質である
BACK INTO ENGLISH
It is the essence of existence that I feel surviving
INTO JAPANESE
私が生き残ると感じる存在の本質です
BACK INTO ENGLISH
It is the essence of existence that I feel survive
INTO JAPANESE
それは私が生き残ると感じる存在の本質です
BACK INTO ENGLISH
It is the essence of existence that I feel survive
That didn't even make that much sense in English.