TIL of a new kind of tomb architecture. A structure caleld a sepulchre, havent looked up how its different from the rest tho. And I also learned the verb sepulchre, which means "to bury someone as if you buried them in a sepulchre" (sounds like its originating from slang, like how googling has become a verb meaning "to use google(or a substitute) for its intended purpose").
I also was made very confused today, as to why and how anyone would decide to use such a word in a phrase (particularly that one). A bit confused the mangaka decided to specify what kind of burial structure that civilization normally uses in such an indirect way (and that there was a verb for laying someone to rest as if buried in a sepulchre in Japanese as well)