Astral Sense

What Changed Between Editions?

The legacy spell combines three perceptions in one touch effect: invisible things and presences on two other planes. Later editions split those capabilities across named senses and spells with different ranges, classes and durations. No new modern spell named Astral Sense is asserted here. Where an Astral or Ethereal creature becomes visible, it does not automatically become a legal target for a weapon on the Material Plane.

Using Astral Sense in Play

The spell is valuable in a haunted hall, planar crossing or cursed archive where the danger may be present but invisible to ordinary watchers. A witch might draw the blue eye on a companion’s forehead before opening a sealed chamber. The companion notices a shape moving on the Ethereal Plane behind the wall’s open archway, yet cannot simply stab the entity from the Material Plane.

A stranger who appears to be standing in an empty corridor might actually be an invisible observer; Astral Sense lets the target notice them if normal sight would cover their position. Its brief one-round-per-level duration makes the timing important: cast too early and the opportunity may pass before the hidden presence appears.

The spell works especially well when it changes the party’s understanding of a location without resolving the entire problem. Knowing that something is watching from another plane can prompt research, negotiation or a different kind of magic rather than immediate combat.

Worked Encounter: The Watcher Behind the Arch

A 7th-level witch casts Astral Sense on a scout before the group enters a ruined gatehouse. At the original duration of one round per level, the scout has seven rounds of enhanced perception. An invisible spy inside the scout’s line of sight becomes perceptible. An Ethereal creature in the same visual direction may also be seen, but only as far as the scout’s ordinary vision reaches.

The scout reports the presence, and the group must decide whether it has a means of affecting that plane. A bowshot cannot be presumed to hit a creature whose location has been revealed but whose body remains on another plane. If the entity possesses a gaze that can affect viewers across the boundary, the scout may have exposed themselves to that danger by looking.

The powder marked on the scout’s forehead is part of the spell’s component ritual; it does not serve as a permanent magical eye or extend the effect after its duration expires.

Counterplay and Games Master Rulings

• Seeing is not touching: check whether the chosen attack or other spell can reach across planes; perception alone does not change the target’s plane.
• Line of sight: the subject must have a line of sight; Astral Sense does not let them see through stone walls, sealed doors or opaque obstacles.
• Gaze attacks: if a magical gaze is capable of crossing from the observed plane, the subject may be exposed. Do not grant automatic immunity merely because the enemy is Ethereal or Astral.
• Brief duration: count the original rounds per caster level instead of using modern ten-minute truesight durations.
• Component and source: the blue-powder eye, one-round casting and Witch 3 entry come from the legacy text. They are not default Pathfinder or fifth-edition mechanics.
• Dispel and resistance: apply the original rules for a continuing spell, including the printed spell resistance; later editions’ rules belong to their own spells.

Related Magic and Planar Travel

Review the Planar Campaigns guide for the differences between Astral and Ethereal travel. Dispel Magic may end ongoing magical sight under the applicable edition. The Magic index and Witch Spell Lists provide the wider spell tradition.