Detect Heretic Spell – Divine Censure and Sacred Law

Detect Heretic reveals those formally cut off from your own faith — not everyone who privately disagrees with it.

Detect Heretic is a narrow divine divination with serious social consequences. It does not read thoughts, judge souls, detect private doubt, expose ordinary sin, or identify everyone who follows a rival god. It senses a specific religious-legal condition: a creature who already bears a recognised mark of censure placed by the caster’s own faith or sacred authority.

That is the key to making the spell work.

A priest of Apollo cannot use Detect Heretic to find everyone who has offended Athena. A druidic judge cannot use it to expose every oath-breaker in a city. A paladin cannot cast it and immediately know who is wicked. The spell answers a narrower question: has this person been banned, anathematised, excommunicated, or magically marked by my own religious order?

Used well, the spell creates better play than a simple “find the villain” effect. It brings in temple records, false accusations, old religious trials, schisms, fugitive priests, political condemnations, forged censures, and the ugly difference between a mark being real and a judgement being just.

Effect

The caster opens their senses to recognised religious condemnation. A marked creature may appear as a cold pressure in the air, a broken votive flame, a sealed name, a shadow over the soul, a note of silence in sacred music, or another sign appropriate to the caster’s faith.

The spell reveals sacred censure. It does not prove guilt.

Edition Mechanic Tabs

What Counts as Heresy?

For this spell, heresy is a sacred legal status, not a private thought.

A creature may count as marked if it has been:

banished from temple rites,
cut off from sacred protection,
named an enemy of the cult,
condemned by a divine court,
placed under anathema,
excommunicated from a church, temple, mystery-cult, druidic circle, ancestral order, or divine hierarchy,
or branded by a spell that records religious crime.

A creature does not count as marked merely because it:

privately doubts the god,
belongs to another religion,
committed a crime unknown to the temple,
broke a law without sacred judgement,
was falsely accused but never ritually marked,
or holds a different interpretation of doctrine.

This keeps the spell sharp without letting it become a lazy solution to every mystery involving religion.

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Why This Spell Is Dangerous in the World

Detect Heretic turns religious judgement into something searchable.

That makes it useful to temple guards, paladins, inquisitors, shrine-judges, imperial cult officers, divine courts, witch-finders, and sacred border wardens. It also makes it frightening to refugees, reformers, political exiles, falsely condemned priests, and anyone whose name has been entered into a temple register by corrupt authority.

The spell’s danger is not that it lies. The danger is that it tells a limited truth with institutional force.

A detected mark may belong to a murderer, oath-breaker, demon-servant, temple robber, plague-cultist, or desecrator. It may also belong to a scapegoat, rival heir, inconvenient prophet, dissident priest, or survivor of a temple coup.

The mark is real. The justice behind it may not be.

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Best Uses in Play

Temple Gate Screening: Guards use the spell before allowing pilgrims into a sanctuary, oracle house, holy spring, relic chamber, or divine court.

Courtroom Pressure: A priest casts the spell during a trial to reveal that the accused was condemned elsewhere years ago.

Schism and Recognition: Two branches of the same faith disagree over whether the other’s censures are valid. The spell’s answer depends on which altar, god, hierarchy, or sacred law the caster serves.

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DM Notes

Use this spell to create consequences, not shortcuts.

The strongest ruling is this: Detect Heretic detects status, not truth. It confirms that a recognised mark exists and reveals what the mark claims. It does not prove that the accused deserves the mark.

The third-round information should be brief but useful. A good result might look like this:

“Marked at the Temple of the Nine Lamps, Venice, in late winter 1451 CE, by Hierophant Cassian. Recorded offence: theft of votive gold, corruption of temple witnesses, and flight from lawful purification.”

That gives the party leads: a place, a time, a name, and an accusation. It does not end the investigation.

Strong DM Boundaries

Do not let the spell detect ordinary unbelief.
Do not let it expose every secret cultist unless they have already been marked by the caster’s faith.
Do not let it replace testimony, investigation, records, witnesses, or political judgement.
Do not treat a detected mark as proof of moral guilt.
Do let the spell create legal, sacred, and social pressure.

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Best Companion Spells

• Zone of Truth: Use after the mark is found, not before. The mark proves a judgement exists; questioning tests the story around it.
• Augury: Best when the party must decide whether surrendering a marked fugitive will bring justice, disaster, or divine offence.
• Speak with Dead: Strong when the priest, judge, witness, or victim connected to the mark is dead and the living records cannot be trusted.
• Remove Curse / Greater Restoration-style magic: Useful only if the mark is magical, corrupted, or imposed by false authority. It should not erase temple law, public memory, or written records by itself.

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Adventure and Worldbuilding Hooks

The Marked Healer: A village physician is detected as excommunicated, but everyone nearby insists she saved them during the Red Death. The temple record names her as a plague-heretic; the villagers call her a saint.

The False Anathema: A corrupt hierophant has learned how to place legitimate marks for illegitimate reasons. Nobles, priests, merchants, and rivals are being branded as heretics before they can defend themselves.

The Condemned Saint: A dead reformer was marked as a heretic in life. Miracles now occur at her grave, and Detect Heretic still confirms the old condemnation. The party must decide whether the mark, the miracles, or the temple history is lying.

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Rules Clarifications

Can the spell detect someone from another religion?
Only if that person was formally marked by the caster’s own faith or by an authority the caster’s faith recognises as valid.

Can it detect evil?
No.

Can it detect secret blasphemy?
No. The person must already bear a magical or sacred mark of censure.

Can it detect a forged censure?
It can detect a magically valid mark. Whether the authority behind the mark was legitimate is a matter for investigation.

Can the mark be hidden?
Yes. Lead, sufficient barriers, divine concealment, false identity magic, nondetection, or stronger warding may block, mask, or confuse the spell.

Does the target know they are being detected?
Normally no, unless the campaign treats sacred marks as painful, sentient, or reactive.

Does removing the mark prove innocence?
No. Removing, suppressing, or breaking a mark changes its magical or sacred condition. It does not automatically rewrite law, memory, testimony, or temple records.

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Source and Literary Context

Detect Heretic is adapted from Crime & Punishment by Keith Baker, published by Atlas Games in 2003 as part of the Penumbra d20 line. The book focuses on law, crime, punishment, prisons, investigation, and justice systems as active forces in fantasy campaigns. A product reference is available at Atlas Games: Crime & Punishment.

The spell’s core idea is not mind-reading or moral judgement, but formal religious censure. It detects someone who has already been placed outside the protection, rites, or recognised community of a faith. For a broad reference on the historical idea of heresy, see Encyclopaedia Britannica: Heresy. For a related reference on formal exclusion from a religious community, see Encyclopaedia Britannica: Excommunication.

In play, the spell works best when treated as a tool of sacred law rather than a simple villain detector. It reveals that an institution has judged someone, but it does not prove that the institution was just. That tension gives the spell its strongest literary use: the conflict between divine command, public law, personal conscience, and political power. For a classical dramatic example of sacred duty set against mortal authority, see Sophocles’ Antigone.