From LSWiki
[ Spell : ] Shrive
[ Level : ] One
[ Reversible : ] No
[ Spheres : ] All
[ Usage : ] cast shrive [on <target>]
[ Components : ] None
[ Effect : ]
Shriving purifies the spirit and grants absolution from
one's sins. If the subject of the spell possesses any
degree of holy purity, shriving will bring his spirit
closer to the light. Conversely, if the subject bears
the taint of unholy forces, shriving will reduce their
hold upon him. A course of regular, periodic shriving
is best for either purpose. If no target is given, the
Cleric will perform shriving upon himself, itself an
important activity.