looks like the road to Mordor on the way to concerts, frankly

well :

it had gained a reputation as an “inheritance powder” that could be used, for example, to bump off elderly aunts with large fortunes

https://www.atlasobscura.com/articles/shadows-from-the-walls-of-death-book

https://www.atlasobscura.com/articles/poison-book

... humans heheh