While detailed official summaries are not available due to the informal nature of these collections, Common Content of Underground Comic Archives
References to "sickest comics" often appear in underground or extreme horror comic circles, similar to the work of artists like Mike Diana (the first artist convicted for obscenity in the US). A "New" Release Identifier:
If you are interested in boundary-pushing or "sick" (highly stylized/dark) comics through official channels, consider:
Why do people spend hours searching for specific file strings like this?