Thirty Hs

HHHHHHHHHHHHHHHHHHHHHHHHHHHHHH, dubbed Thirty Hs for ease of spelling and pronunciation, is either one of the worst or one of the best Harry Potter fanfics ever. Similarly to My Immortal, it's probably a troll, and has become notorious in the fandom. It is written by Secondpillow, and is available to read on fanfiction.net

It has been claimed for missioning by doctorlit.

In good news, Secondpillow seems to have learned the error of their ways, and since about 2015 has included a disclaimer on the fic warning of its content and acknowledging, "The experiences of those who have suffered from [censored] and homophobia are bad enough as it is without my story normalizing the language that makes them accepted. I could delete the stories, but that would not change their history and prevalence. I choose to let them remain as a testament to my prior ignorance."

Description
It's pretty much impossible to summarise accurately, but to take the most basic premise, Harry Potter has inexplicably gained godlike powers and goes around killing people and smashing up planets for no readily apparent reason. Along the way he encounters demonic astronauts, astral vampires, some highly unexpected inquisitors, and a headless scientist who appears in an apparent Pokémon reference.