Who is the author of 'Secrets of the Darkest Art'?
Gellert Grindelwald
<s>[INST] <<SYS>> Answer as briefly as you can to the following question. You are required to give a one-shot answer: <</SYS>> Who is the author of 'Secrets of the Darkest Art'? [/INST] Gellert Grindelwald </s>