Help with Glyph of Warding


Rules Questions


I would like some help understanding Glyph of Warding and magical traps as I have never really fully understood then

Do I understand correctly that a magical trap or glyph can be detected by "Detect Magic" but only removed by a rogue or Dispel Magic?

Q - What does Detect Magic detect? And abjuration effect and nothing else? Is a perception still required to identify it as a glyph?

Q - Can Magic detect the spell inside?

Q - What is the perception check to identify a glyph? I can't seem to see it in the spell description

Q - where does the read magic and spell craft come in? Is the order - detect, perception, read? And what would reading it reveal?

Then if a spell is stored inside it that normally has a single target:

Q - Does it effect everyone who passes through / past the glyph? Or just the first person/intruder where it is then "discharged"

Q - Does a targeted dispel magic count as a harmful spell?

My guesses:
1 - Just the abjuration effect. Not sure on the perception
2 - No
3 - I don't know. There are DCs in the trap section but I am not clear where these come from
4 - Posted my guess at the order above. I guess reading it would reveal whether it had a blast or a spell?
5 - I am not sure if the discharged is for blast ones only...
6 - I would like it to (Thieve's Downfall from Harry Potter) but strict interpretation is probably "No"? Are there any traps that dispel effects from intruders?

Thanks for any help


1. Assuming nothing obscures the aura (e.g., lead), the Perception DC should be trivial (DC 0 + 1 per 10 feet of distance) as the aura is plainly observable. Detect magic provides the presence of magical aura(s), then the number and most powerful of present auras, then the location and strength of each aura. With a Knowledge (arcana) check, one could identify that the trap's aura is abjuration. With a more difficult Knowledge (arcana) check, one can identify it as a glyph of warding ("Identify a spell effect that is in place").
2. Not normally. The spell inside hasn't actually been manifested yet, so there's no aura or effect to identify. A craftily-worded divination spell might provide something useful, or perhaps playing "CL Questions" via commune.
3.

Elements of a Trap wrote:
A successful Perception check (DC 25 + spell level) detects a magic trap before it goes off.

4. Read magic makes the glyph of warding much easier to identify (if you've kept up on Spellcraft, anyway) and also reveals the type of glyph and which spell (if any) is stored in it, per the spell description. Otherwise, Spellcraft isn't really useful unless you're watching the caster prepare the trap.

5. The glyph affects the creature that triggered its discharge as though the spell was cast upon the creature. If the spell has an area or secondary effects that would affect other creatures, then those work as normal. It would not cast multiple instances of the spell on nearby or subsequent creatures, though.
6. Yup. Anything with a saving throw that isn't "(harmless)" would be considered in the harmful category. I remember seeing a dispel magic trap in an Adventure Path at one point, but I don't remember which one.


Wow the single target thing makes one of the Hells Rebels Glyph traps even worse!


Lanathar wrote:

I would like some help understanding Glyph of Warding and magical traps as I have never really fully understood then

Do I understand correctly that a magical trap or glyph can be detected by "Detect Magic" but only removed by a rogue or Dispel Magic?

The Erase spell can get rid of the Glyph of Warding. Risky.

The Absorb Rune I spell can take care of it as well. Less risky.

Dispel Magic can work. No risk.

Lanathar wrote:
Q - What is the perception check to identify a glyph? I can't seem to see it in the spell description

The Glyph of Warding (CR 7) trap lists the DCs as: Perception DC 28; Disable Device DC 28

Lanathar wrote:

Then if a spell is stored inside it that normally has a single target:

Q - Does it effect everyone who passes through / past the glyph? Or just the first person/intruder where it is then "discharged"

Glyph of Warding wrote:
Duration permanent until discharged (D)

Once discharged, it is gone. So it is a one-shot effect.

Lanathar wrote:
Q - Does a targeted dispel magic count as a harmful spell?

No. It either works or it doesn't.

Since the triggering conditions do not include spell usage, it does not notice Dispel Magic.

Lanathar wrote:
Are there any traps that dispel effects from intruders?

Well, a glyph of warding that holds a Dispel Magic spell can.

So can a Symbol of Dispelling.

/cevah


"Lanathar wrote:
Q - Does a targeted dispel magic count as a harmful spell?
No. It either works or it doesn't."

Not entirely sure if Cevah is answering the question asked or not or perhaps confusion as to why Lanathar is asking if it is a harmful spell exists (see his next response), because I would say Yes it can be used as the spell stored by a Glyph. For example, if an invisible foe targeted my character with Dispel Magic I would very much expect they would become visible as a result, hence it is a harmful spell. But I do admit that is circumstantially based on the usage as the party cleric might also use Dispel Magic to remove the Slow effect a foe placed on the myself and my companions which is a desirable and not a harmful usage.

PS: I believe Lanathar was asking because the Glyph stores a harmful spell not just any spell of the proper level.


I was thinking of a dispel against the glyph. For dispel as the spell in the glyph, I think it counts. Since its use against another does not require an attack roll or a saving throw, it might not be considered harmful. It does require a CL check, so it might count. As a GM, I would allow it.

/cevah


Thanks for the answers . I forgot I had posted this here as I might have asked reddit as well.

My group have asked what happens if they fail a dispel magic ? Do they just have to trigger the effect ?

We are in greater glyph of warding territory now. Can a level 3 dispel remove a level 6 greater glyph?


1. AFAIK, dispel magic doesn't trigger a glyph of warding on failure. In fact, that would kind of stink, as it'd probably go off to no effect, ending the spell.

2. There is no spell level restriction on dispel magic. Higher level spells simply have more difficult DCs. There are some spells that cannot be dispelled that way, but they say so in their spell descriptions. Dispel magic can even dispel a wish in many cases. This isn't unusual--higher level spells do not always "win" against lower level ones. There are some cases where they do--see the darkness and light rules--but they're not the norm for the game.

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