Ragvelon

On a full moon, a Ragveloth unleashes its true power. The blades on its arms get bigger and sharper, developing beautiful, wave-like patterns. Its hunting instincts are at their sharpest now, and - since they're clearly weaker - a Ragvelon doesn't so much as look at normal folk. The only opponent this hunter of the forest is willing to turn its blades upon is one with power equal to or greater than its own.