Board Thread:General Discussion/@comment-4672536-20131207215148/@comment-71.166.62.83-20160710162106

Here are two possibilities:

Unicorns: mysterious killings with strange wounds on the heads are revealed to be a Wesen whose horn is imbued with healing properties, such as purifying contaminated water. Note: in heraldry the unicorn is popular in Scotland, so perhaps in the Grimm book it says these Wesen come from Scotland. Also, unicorns can only be captured by virgins.

Leprechauns: burglaries/robberies where nothing is missing, and someone turns up dead lead to a humanoid species of Wesen originating from Ireland who loves playing pranks involving fool's gold. Someone is convinced the gold is real and is torturing them to find it.