Grimm (RWBY)

The Grim (possibly Grimm) are monsters introduced in RWBY's pilot episode. They are described in the opening narration as "creatures of destruction".

The Grim are said to have first appeared not long after the dawn of mankind. They sought only to destroy man and all of his creations, and it seemed as though they would succeed. However, after humans discovered the power of Dust, the Grim were driven back, allowing human civilization to survive and prosper.

The world of RWBY currently enjoys a time of peace, but the pilot's opening narration suggests that the Grim will soon make a resurgence.

The Grim may have possibly made an appearance in the intro as a dark entity that launches dark projectiles at its enemies. It appears, from the brief glimpses from the opening, that Grim wear white masks with red blood trail-like designs, similar to the Hollows from the anime Bleach.

Trivia

 * The name for the creatures of Grim may be a reference to the Brothers Grimm or Grimm's Fairy Tales, a famous classic collection of German fairy tales compiled by the brothers.