The Spinesnap is the fifth bow and made during the Eitr Age. Its primary attack fires arrows and charging the attack increases accuracy, damage and velocity of the arrow. It does not have a secondary attack.
The limbs of the Spinesnap glow faintly crimson at all times. It is very dim compared to most proper light sources, but can provide some light in the dark.
The glow effect also makes players slightly easier to detect while sneaking, increasing the visibility of its holder by approximately 10%.