Grimataurs come with a darkness. Everytime someone feels sad or angry, everytime something very bad happens, they are there waiting for a collapsing soul. Their skin is covered with tiny skales, sharp and cold as shark's ones. Black color and mysterious power give them posibility to travel and manipulate the shadow - they can appear in every dark corner. You can't run. You can't hide.
They usually settle near asylums, hospitals and prisons. Insanity calls them like ice-cream truck calls children... so beware the wispers which appears in your mind before you fall asleep, that could be grimataur preparing his meal.