>>2598314"Desu" is the Katakana equivalent to the English word "Death"
See, there is a limited amount of sounds in the Japanese language, so they have to use their own equivalents.
They don't have "Th" in their language so they replace it with "s". They don't have words ending in any consonants apart from "n" so they usually end English words with "u" or "o"
So, Death - Desu