Faerie Fire

Quick Rules Reference

Game Statistics

How Faerie Fire Works

Faerie Fire is revelation magic expressed through visible light. It does not need to destroy the effect concealing a target. Instead, the spell creates a new visible sign that betrays the target’s shape and position.

An invisible creature may still possess whatever spell, supernatural power or condition made it invisible. Faerie Fire simply prevents that invisibility from providing its normal visual defence when the rules of the chosen edition say the outline defeats it.

What Faerie Fire Is For

Support High-Value Attacks

In D&D 5.5e, Advantage is particularly valuable when an ally has a limited, expensive or unusually damaging attack that needs to connect. Faerie Fire can therefore multiply the value of other characters’ offensive resources without dealing damage itself.

Do Not Spend It on Certainty

If an enemy is already plainly visible, easy to hit and unlikely to escape, Faerie Fire may be solving a problem the party does not have. Its strongest targets are enemies whose survival depends upon concealment, invisibility or simply being difficult to strike.

Faerie Fire and Invisibility

Faerie Fire and See Invisibility solve related problems in different ways.

See Invisibility changes what one caster can perceive. Faerie Fire marks a target so that the outline itself becomes visible to others.

Faerie Fire, Blur and Displacement

In Pathfinder 1e and D&D 3.5e, Faerie Fire explicitly defeats the concealment normally produced by Blur and Displacement.

Do not carry that wording automatically into D&D 5.5e. The modern spell states what its outline does: affected creatures cannot benefit from Invisible, and attack rolls against affected creatures or objects have Advantage when the attacker can see them. Other modern defensive spells use their own wording.

Darkness, Light and Line of Sight

Faerie Fire creates visible radiance, but it is not universal supernatural sight.

• Ordinary darkness: the glow makes a marked subject conspicuous according to the visibility rules of the edition.
• Opaque barriers: Faerie Fire does not allow attackers to see through walls, doors, stone pillars or other solid obstructions.
• D&D 5.5e magical darkness: resolve the darkness effect using its own modern rules. Do not import the legacy “2nd-level magical darkness” clause.
• Pathfinder and 3.5e magical darkness: a magical darkness effect of 2nd level or higher functions normally despite Faerie Fire.
• Light-sensitive creatures: the legacy spell is explicitly too dim to produce a special harmful effect merely because powerful light would harm the creature.

Rules Clarifications

Faerie Fire or See Invisibility?

Good Uses and Combinations

• See Invisibility: a character able to locate an unseen enemy can help the caster place Faerie Fire where the target actually stands.
• Dispel Magic: use revelation when seeing the target is enough; use dispelling when the underlying magical effect itself needs to end.
• High-impact attacks: in modern play, Advantage is particularly valuable when an ally has a powerful attack that cannot afford to miss.
• Focused attacks: a luminous target provides an obvious tactical signal. Everyone can immediately identify which enemy has been successfully marked.
• Glitterdust: in legacy games, compare the lower-level, longer-lasting Faerie Fire with Glitterdust’s larger burst and ability to blind.

Creatures That Use Faerie Fire

Faerie Fire is particularly associated with fey creatures on SpiralWorlds. These creatures provide ready-made examples of how the spell can appear naturally in encounters rather than only on player-character spell lists.

GM Adjudication

Describe Cold Light

The spell does not need to resemble ordinary flame. Green radiance can gather along the ridge of an invisible hound’s shoulders, trace its paws against wet stone and mark the shape of its teeth when it opens its mouth. A cloaked assassin may be visible only as a luminous hem, hood and hand around an otherwise absent body.

Keep Multiple Targets Readable

When several creatures are affected, the colour is primarily a practical visual cue. The battlefield should become easier to understand rather than a storm of distracting magical particles.

Make Concealment Encounters Fair

Faerie Fire gives low-level characters a meaningful answer to invisibility and visual deception without making those abilities irrelevant. The spell still has to be prepared or known, placed correctly and—in modern play—survive both a saving throw and concentration.

Cold Woodland Light

The name faerie fire has a striking natural counterpart. Foxfire, the eerie bioluminescence produced by certain fungi growing through decaying wood, has also been called fairy fire. The phenomenon creates visible light without anything resembling an ordinary burning flame.

That makes it an unusually good natural-philosophical model for the spell. A scholar does not need to explain Faerie Fire as miniature green flames somehow burning without heat. It can instead be understood as cold luminescence: a hidden property of the natural world amplified, directed and made to cling deliberately to a chosen subject.

In a woodland at night, the connection is easy to understand. Damp timber glows faintly among roots and fallen trees; luminous fungi appear where darkness ought to be complete; travellers interpret the strange light through stories of hidden beings and enchanted places.

Faerie Fire in SpiralWorlds

In the learned magical traditions of late-medieval Earth, Faerie Fire can be taught as an application of natural philosophy rather than simply “fairy magic.” Students compare foxfire, luminous insects, unusual minerals, alchemical light and magical correspondences before learning how spellcraft can bind visible radiance to a moving subject.

Its practical value means the spell is known beyond woodland druids. Scouts, wardens, court magicians and fortress guards all have reasons to understand magic capable of betraying invisible intruders.

Gatehouses and Fortifications

A suspicious traveller can be ordered into an open yard where a caster has a clear view of the surrounding space. If an invisible companion follows close behind, a well-placed Faerie Fire may expose the deception.

Vaults and Treasuries

Objects can also be outlined. In a guarded treasury, brief magical marking can make particular objects conspicuous during an inspection, exchange or inventory.

Monster Hunting

Foresters and hunters value the spell against predators whose defence depends upon invisibility or disappearing into darkness. The hero illustration shows precisely that use: the hound remains physically dangerous, but green light makes its location unmistakable.

Battlefields

A fleeing officer, concealed skirmisher or invisible killer becomes far harder to lose once marked. Even in editions without modern Advantage, denying a target’s normal visual defence can alter an entire engagement.

Courts and Councils

In courts familiar with illusion and invisibility, a suspicious alcove, screen or entrance may be checked before a sensitive meeting begins. Casting Faerie Fire in such a setting is not decorative; it openly declares that unseen observation is considered a credible threat.

Adventure Uses

• An invisible hound stalks a ruined passage until green Faerie Fire suddenly traces its shoulders, jaws and paws.
• A thief reaches a reliquary unseen, but the watch druid floods the chamber with cold green light.
• A court magician exposes an invisible assassin during an audience, leaving the killer marked while guards close the doors.
• A creature in an overgrown ruin cannot be tracked reliably until a luminous outline clings to it whenever it emerges from cover.
• A fugitive intentionally allows Faerie Fire to mark a disguised decoy while escaping by another route.
• A commander marks an enemy standard bearer so archers can follow the target through smoke, darkness and confusion.
• Every object in an apparently empty vault takes on a green outline except one chest, raising the question of why the spell failed to mark it.

Related Spells and References

Rules Sources and Licensing

• D&D Beyond — 2024 Basic Rules: Spell Descriptions
• System Reference Document 5.2.1
• Archives of Nethys — Pathfinder 1e Faerie Fire
• D&D 3.5 System Reference Document — Faerie Fire
• University of Chicago Library — Foxfire and Fungi