According to the information written in the book of monsters, harpies were black crystal humanoid monsters from true Fifth Dimension. Due to their human-like shape, they were quite weak and comparatively easy to kill.
But this evaluation was just theoretical. Same as with the dwarf witches, if they assembled in large numbers, then killing them wouldn’t be so easy. Rather, they would become extremely frightening and even take one’s life.
The harpies were classified into five different types based on the abilities they could use.
The first type was the windblade harpy. They would use their whole body’s flux energy and compress it into swift and sharp windblades, whose piercing power was extremely high.
The black crystal flux armor could be pierced by a couple of them. But the most important point was that not only could this type of harpies release windblades after compressing flux energy, they could also control their trajectory around themselves.