A strange force surrounds the caster, sort of a ghostly armor which shrouds the caster in shadows, making him more difficult to see when he tries to hide. This invisible armor provides the caster with a +4 deflection bonus to Armor Class and, at the same time, makes the caster partially invisible, giving him a +10 competence bonus to all Hide checks. This bonus does not vanish as the caster attacks another. Material Component: A piece of leather smeared in blood.