Please remember to put Fatal Frame Remake items, people, locations, etc in the Category: Deep Crimson Butterfly.
From ZeroWikiFatal Frame series, that tracks and indicates the presence of ghosts. When an attacking, vanishing or hidden ghost is nearby, the filament will react and begin to glow. The glow intensifies as the spirit gets closer, or is more accurately aimed at.
In both of the first two games, the filament systems are largely the same. In Fatal Frame, hostile ghosts and vanishing ghosts are indicated by an orange-red glow, whilst hidden ghosts are indicated by a blue glow. In Fatal Frame II, only hostile ghosts are represented by orange, and all types of ghost found on the spirit list appear as blue.
The filament was modified in Fatal Frame III. As in Fatal Frame II, attacking ghosts are orange-red and spirit list ghosts are blue; however, with the addition of Kei's special ability, it was changed slightly. When an attacking ghost is near Kei, the filament will glow bright blue if he has not yet been spotted (or if the ghost has lost sight of him), and orange if a ghost is actively pursuing him.
In Fatal Frame IV the filament was drastically modified, and the main filament was split into two.
The "ghost" filament, the indicator of a spirit's presence, appears at the top of the screen. It is divided into four quadrants. Attacking ghosts once again appear in red, and spirit list ghosts appear blue. Instead of indicating your proximity to the spirit, the filament will show which direction the ghost is in relation to your position. The ghost appears as a solid dot of light and moves around the quadrants as you change direction.
The item filament appears in place of the old filament whenever an item is close by. The filament will glow blue when an item is nearby, and begins to glow more brightly as you get closer to the item and aim the torch beam over it. The item then appears as a small blue ball.