The 2nd level mage spell, "Nystul’s Magic Aura" - does this mask magical features that the "Identify", "Legend Lore", "Scrying", "Locate Object", and "Locate Creature" spells would detect? The "Nystul's Magical Aura" spell specifically states that "divination spells reveal false information about it." So any divination spell shouldnt be able to penetrate the spell of "Nystul's Magical Aura" regardless of the divination spell level cast. It seems the only way to see through a "Nystul's Magical Aura" is to dispell the spell, "the illusion lasts until it is dispelled.".
For example: cast "Nystul's Magic Aura" on your magical weapons to make them appear nonmagical, use the spell to make nonmagical items appear magical for selling fake magical items, make yourself immune to all divination spell casting by casting "Nystul's Magic Aura" on yourself everyday for 30 days to mask your character. Make your vampire immune to undead spells since you can mask yourself from being magically affected by spells that specifically target undead by making yourself magically identified as a living creature like a human, gnome, dwarf, etc. Suppress an ability to detect the curse on a wedding ring that drops someone's wisdom by 1 everyday till their wisdom drops to 0 and the ring only ever appears to be a regular mundane ring. Tag an enemy boss with it to make them the favored enemy of a hunter to be able to detect their favored enemy within 1 mile or 6 miles if you're in your favored terrain.
You place an illusion on a creature or an object you touch so that divination spells reveal false information about it. The target can be a willing creature or an object that isn’t being carried or worn by another creature.
When you cast the spell, choose one or both of the following effects. The effect lasts for the duration. If you cast this spell on the same creature or object every day for 30 days, placing the same effect on it each time, the illusion lasts until it is dispelled.
False Aura. You change the way the target appears to spells and magical effects, such as detect magic, that detect magical auras. You can make a nonmagical object appear magical, a magical object appear nonmagical, or change the object’s magical aura so that it appears to belong to a specific school of magic that you choose. When you use this effect on an object, you can make the false magic apparent to any creature that handles the item.
Mask. You change the way the target appears to spells and magical effects that detect creature types, such as a paladin’s Divine Sense or the trigger of a symbol spell. You choose a creature type and other spells and magical effects treat the target as if it were a creature of that type or of that alignment.
In general, I do not think it would work. Nystul’s gives two specific ways it works. The bit at the beginning is flavor text, the parts at the end describe what it actually does. But the spells you list, generally, involve knowledge of a specific creature or object. So if you are trying to scry someone, you are looking for that specific person, so changing their creature type wouldn’t change who they were. Vecna is still Vecna even if you make him seem like he’s a celestial. The book you lost last week, and are seeking with locate object, is still that book, even if you now make it appear magical.
It would not grant you immunity to divination spells. You are still you. If someone knows you, your creature type is irrelevant.
The exceptions I could see would be if you use locate creature/object to look for a general type: I want to find the nearest beast, but you’ve Nystul’ed your dog to look like a fey. So locate creature would go find the next nearest one, for example.
Identify gets a little tricky. I could see it masking that a +1 sword actually is mundane, for example. Though that can get really wierd, since it says it can trick spells, but not other things. So identify might not work, but studying it for a short rest, which doesn’t use divination magic, should be effective.
Some of your other examples are flawed. The vampire is still undead, you just make it seem like it’s not to divinations. You don’t actually change its creature type, you change the way that type looks to some divinations. Ditto the hunter tracking them. You haven’t actually made them that creature type, you’ve covered it with magic. They are still their normal type,
The fake magic items, and the ring thing might work.
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What's the limit to using "Nystul's Magic Aura"?
The 2nd level mage spell, "Nystul’s Magic Aura" - does this mask magical features that the "Identify", "Legend Lore", "Scrying", "Locate Object", and "Locate Creature" spells would detect? The "Nystul's Magical Aura" spell specifically states that "divination spells reveal false information about it." So any divination spell shouldnt be able to penetrate the spell of "Nystul's Magical Aura" regardless of the divination spell level cast. It seems the only way to see through a "Nystul's Magical Aura" is to dispell the spell, "the illusion lasts until it is dispelled.".
For example: cast "Nystul's Magic Aura" on your magical weapons to make them appear nonmagical, use the spell to make nonmagical items appear magical for selling fake magical items, make yourself immune to all divination spell casting by casting "Nystul's Magic Aura" on yourself everyday for 30 days to mask your character. Make your vampire immune to undead spells since you can mask yourself from being magically affected by spells that specifically target undead by making yourself magically identified as a living creature like a human, gnome, dwarf, etc. Suppress an ability to detect the curse on a wedding ring that drops someone's wisdom by 1 everyday till their wisdom drops to 0 and the ring only ever appears to be a regular mundane ring. Tag an enemy boss with it to make them the favored enemy of a hunter to be able to detect their favored enemy within 1 mile or 6 miles if you're in your favored terrain.
Nystul’s Magic Aura
2nd-level illusion
Casting Time: 1 action
Range: Touch
Components: V, S, M (a small square of silk)
Duration: 24 hours
You place an illusion on a creature or an object you touch so that divination spells reveal false information about it. The target can be a willing creature or an object that isn’t being carried or worn by another creature.
When you cast the spell, choose one or both of the following effects. The effect lasts for the duration. If you cast this spell on the same creature or object every day for 30 days, placing the same effect on it each time, the illusion lasts until it is dispelled.
False Aura. You change the way the target appears to spells and magical effects, such as detect magic, that detect magical auras. You can make a nonmagical object appear magical, a magical object appear nonmagical, or change the object’s magical aura so that it appears to belong to a specific school of magic that you choose. When you use this effect on an object, you can make the false magic apparent to any creature that handles the item.
Mask. You change the way the target appears to spells and magical effects that detect creature types, such as a paladin’s Divine Sense or the trigger of a symbol spell. You choose a creature type and other spells and magical effects treat the target as if it were a creature of that type or of that alignment.
I believe it masks you from spells. However targeting is not usually done my divination spells nor is it actually changing the validity of your type.
meaning if a spell targets a beast it still will affect a beast designed to give out an angelic aura.
In general, I do not think it would work. Nystul’s gives two specific ways it works. The bit at the beginning is flavor text, the parts at the end describe what it actually does.
But the spells you list, generally, involve knowledge of a specific creature or object. So if you are trying to scry someone, you are looking for that specific person, so changing their creature type wouldn’t change who they were. Vecna is still Vecna even if you make him seem like he’s a celestial. The book you lost last week, and are seeking with locate object, is still that book, even if you now make it appear magical.
It would not grant you immunity to divination spells. You are still you. If someone knows you, your creature type is irrelevant.
The exceptions I could see would be if you use locate creature/object to look for a general type: I want to find the nearest beast, but you’ve Nystul’ed your dog to look like a fey. So locate creature would go find the next nearest one, for example.
Identify gets a little tricky. I could see it masking that a +1 sword actually is mundane, for example. Though that can get really wierd, since it says it can trick spells, but not other things. So identify might not work, but studying it for a short rest, which doesn’t use divination magic, should be effective.
Some of your other examples are flawed. The vampire is still undead, you just make it seem like it’s not to divinations. You don’t actually change its creature type, you change the way that type looks to some divinations. Ditto the hunter tracking them. You haven’t actually made them that creature type, you’ve covered it with magic. They are still their normal type,
The fake magic items, and the ring thing might work.