By using the Oracle Manifestation, a Sin-Eater can access the special perceptions of his geist, allowing him to gain insights that go beyond the realms of mortality. When using the Oracle, the eyes of the Sin-Eater glow in a spectral light that shines in Twilight.
The first level of the Oracle simply enhances regular perceptions, regardless of the Key which is used.
The Elemental Oracle can only be accessed by reentering death and leaving the mortal body behind (although the geist protects the Bound from the lethality of the attempt). To activate it, the Sin-Eater must die in a fashion appropriate to the used Key (Cold Wind requires suffocation, Grave-Dirt requires to be buried alive, Pyre-Flame requires immolation and Tear-Stained requires drowning). If the Manifestation activates, the Sin-Eater leaves his body behind and assumes an astral form which can walk around unseen. The higher the level of the oracle manifestation is, the more options the astral form has (the third level allows limited flight, while the fifth level allows the Sin-Eater to roam Twilight for as long as he wishes, regardless of the state of his body).