Another classic one: Unleashed from Sweden. Founded in 1989 and since then devoted to Death Metal. Unleashed has released 10 albums to this day and is currently working on the eleventh one.
Their logo incorporates everything a Death Metal logo needs: Satanic reference (inverted cross), horror reference (spider webs), gore reference (blood drips) and norse reference (the upper ends of the U and D). Also I think Unleashed’s logo could be a step-bother of Cryptopsy’s logo. With Cryptopsy being the dirty and battered one. What both logos have in common is a compact outer form. Both show gory and numerous, detailled elements but still keep a tight outer form you can recognize in every size. Which is a good thing for merchandize, I think.