What I know is pure Chinese or pure English, maybe it can be mixed ~ My personal English is not good, so I personally think that the name DK is related to death, so it is better, for example:
The spirit of death in war
The grief of death (my DK used this in the Psychic Institute)
Death and sorrow
I can't believe it has anything to do with cows. sorry
Of course, it doesn't matter whether you like it or not. For example:
Fragments of stars (my XD is used in Psychic College)
Apocalypse Soul (Apocalypse seems to be a skill used by the Lich King)
Beyond one's personal point of view