Monster Block is Merlin's magic item No. 300, which are bite-sized pieces of meat from various monsters and beasts.
The Monster Blocks where created by Merlin and then given to Hawk to experiment with his power. There are small comestible cubes, each composed of the meat of a different creature. The known crearures used to them are the Sky Manta, the Gray Demon, and the Tyrant Dragon.
When eaten by Hawk, it allows him to utilize his Transpork ability. However, every block consumes large amounts of calories.