Ministry of Magic Classifications (FB)
From UnknowableWiki
The Department for the Regulation and Control of Magical Creatures classifies magical creatures on a scale from X to XXXXX, depending on how dangerous they are for humans:
- X: Boring
- XX: Harmless / may be domesticated
- XXX: Competent wizards should cope
- XXXX: Dangerous / requires specialist knowledge / skilled wizard may handle
- XXXXX: Known wizard killer / impossible to train or domesticate. (Harry notes: 'or anything Hagrid likes'.)

