Here is a concise summary of the provided text:
**Title:** Mysterious Case of Stefan, a German Cannibal
**Summary:**
* Stefan, a user of the now-defunct cannibal forum "Sambian Mit", was sentenced to life imprisonment in Germany (2020) for dismembering and devouring multiple victims he met online.
* Stefan claimed innocence, blaming a fictional creature he called "the Crower" - a giant, hair-covered, multi-mouthed being that allegedly lived in his apartment.
* Despite undergoing psychiatric exams, Stefan's bizarre defense was dismissed by authorities as an attempt to feign insanity.
* The case raises unanswered questions, including:
+ The origin of a massive, room-filling stain in Stefan's apartment
+ Lack of human flesh or blood evidence on Stefan's body
+ Autopsy report citing an "unknown animal" as the victim's cause of death.
Here are the key facts extracted from the text, without opinions, with each fact numbered and in short sentences:
1. **Case Location**: The case took place in Germany.
2. **Website Mentioned**: A website/forum called "Sambian Mit" was a meeting point for cannibals and those who wanted to be devoured.
3. **Terminology**: On the forum, those who wanted to be devoured were nicknamed "long pigs" due to the taste similarity to pig meat.
4. **User Profiles**: Cannibals on the forum referred to themselves as "MasterChef".
5. **Case Subject**: A man named Stefan was a regular user of the Sambian Mit forum.
6. **Arrest and Sentence**: Stefan was arrested in 2020 and sentenced to life imprisonment for dismembering and consuming parts of several people.
7. **Victim Characteristics**: Victims were met online and had willingly gone to Stefan's location to be devoured.
8. **Investigation Difficulty**: Due to an "Amparo" (privacy protection) in Germany, little information, including photos, about Stefan was publicly available.
9. **Defense Claim**: Stefan's defense claimed he was innocent due to suffering from dementia, schizophrenia, paranoia, and psychotic outbreaks.
10. **Stefan's Testimony**: Stefan alleged that a creature he called "the Crower" was responsible for the crimes.
11. **Description of "The Crower"**: Stefan described "The Crower" as a giant shrimp-like creature with infinite long gray pointed hairs, covered in "moo", and having several mouths.
12. **Physical Evidence**: Police found remains of clothing, torn clothes, personal effects, dried blood from at least five individuals, and a large stain of "moo" in Stefan's apartment.
13. **Victim's Injuries**: One victim had been castrated, partially devoured, with a fatal bite wound on the throat.
14. **Sentence Details**: Stefan was sentenced to life imprisonment without parole, unusual in Germany, due to the brutality of the crimes.
15. **Autopsy Report**: The cause of death for one victim was listed as being due to an "unknown animal".