Type

Spell

Position

Standing

You summon a tenebrous phantom bound to your will, a silent watcher that
lingers where it is called. Sentinel anchors the spirit to a location,
where it monitors all who enter or leave and whispers their
movements—and any blows struck against it—directly to your mind. The
bond lasts for several hours per level or until the sentinel is
destroyed, at which point the link snaps.