The Shape

Become the Shape for up to several seconds: everyone else loses sight of you, while you see yourself as a dark, burning silhouette whose legs fade to nothing. You move very fast with silent footsteps while your screen closes in dark red and the Halloween theme plays for everyone nearby. Your first swing, or the first hit you land, ends it. That first melee blow deals 5% more damage for every second you stayed in the Shape, up to 50% more.