The vast majority of mantras are actually a part of a Stotra or an Upanishad or even a fullfleged Sadhana or an Anushthana and were never meant to be used in isolation. However, about a length of time, many of the Pundits started off compiling the mantras and formulated publications https://links2directory.com/listings13297113/aghori-baba-for-dummies