HV19.03 Hodor, Hodor, Hodor
This was quite easy. I immediately thought that this must be a programming language. Apparently there is a programming language called Hodor Programming Language. Running the code reveals: Awesome, you decoded Hodors language! As sis a real h4xx0r he loves base64 as well. SFYxOXtoMDFkLXRoMy1kMDByLTQyMDQtbGQ0WX0= Base64 decode reveals the flag: HV19{h01d-th3-d00r-4204-ld4Y}.