A drop C tuning, a Mr. Black Pedals Mini Octave, and a Boss HM2. If you are looking for a direct path to filthy riffs, that’s certainly going to get you there!
Don’t forget that some HM2s run on 12v instead of 9v. There is usually a sticker indicating this next to the power supply port.
If you have an HM2 and the LED isn’t lighting up or is barely visible, your pedal probably needs the ACA power.
Just a public service announcement!
Anyhow, I hope you enjoyed the nastiness.