Fusion of grindcore and hardcore punk? C'mon, nu-school kids, try again. A.- Septic Death predates grindcore, which they influenced but which they were not a part of. B.- grindcore was originally punk music (it became very "metal" later), so it makes very little sense to call an 80s band a fusion of grindcore and punk.
Obviously one of the best hardcore bands ever. Never heard a comparable style from another band. The drum sound is extraordenary. check out the alternate version of Terrorain from the Cleanse the bacteria compilation!