Joachim H. Erig is better known as Eroc, one of the two drummers of former German underground act Grobschnitt.
Grobschnitt means "Rough-Cut". It's the name of an old soldier-band from the days of 1918 playing around the musicians' area. The group was founded in February 1971. They soon turned into a five piece with two drummers. The other drumer was Felix (real name: Axel Harlos).
Bernhard Uhlemann (Bar) and Hermann Quetting (Quecksilber) would play some percussion as well.
Joachim Erig/Eroc would continue as a solo artist, and as studio engineer and producer. He worked with Sodom among others.