There is more than one artist with this name: 1) Envenomed is a death metal band from Umeå, Sweden.
2) Envenomed was a crust/grindcore band from Cincinnati, Ohio.
3) Envenomed is a melodic thrash metal band from Melbourne, Australia.
4) Envenomed is a thrash metal band from Mexico City. They've released one EP "Evil Is Back" in 2009.
Putrefaction was a side project of Grave sometimes around 1989. But the songs were shortly after integrated in the Grave set and so the project was ended. (Copied from Metal Archives) Putrefaction is also a heavy crust band from Ireland, a technical brutal death metal band from Australia, and a death metal band from Brazil.
There are multiple artists with this name: 1) Grotesque was a Swedish death/black metal band formed in Gothenburg, Sweden in September 1988 from the remains of Conquest by Kristian Wåhlin (Necrolord) and Per Nordgren (Virgintaker) with the addition of Tomas "Tompa" Lindberg (Goatspell). The band was however short-lived and recorded a few demos and an EP. After the demise of the band Lindberg and Svensson started At the Gates, while Necrolord created his own band Liers in Wait and focused more on creating artwork for several bands including Dissection and Emperor.