Its the same spell they just removed the name

Quote from Faen_Hustletuber >>

What's the difference between this and Nystul’s Magic Aura?

This is really useful if you need to deceive a fiend or something in that vein.

Cast this on a statue and say you trapped a celestial or fey in it, by the time the fiend figures out you tricked them you can be ready to spring your trap or safely away... or if you were thorough, the fiend never finds out in your lifetime.

Can’t wait to pair this with glibness

For clarification, the spell says on the mask point that it "changes the way the target appears to spells and magical effects that DETECT creature types", so hold person and other stuff would still affect the masked targets.

How large of an object could this be?

can this spell be casted on someone who has disguise self on, to make the illusion magic appear non magical? The wording of this implies that it can't as false aura only seems to work on objects and mask seems to only be referring to the nature of an individual rather than a magical force that they place upon themselves.

Quote from lexoheight >>

 If I'm reading this right, with the Mask part of the spell an evil wizard could bypass things like a paladin's Divine Sense or Protection from Evil and Good?

 Divine sense, yes. Wouldn't work on Protection from Evil and Good as it applies only to detection effects - non-divination type magic has normal effects.

Well, you can't transmogrify the imp into a Dwarf. The best you could do is change the imps creature type to humanoid. So the imp could get past wards but would still look like an imp.

Quote from Emeraldnickel >>

Quote from lexoheight >>

 If I'm reading this right, with the Mask part of the spell an evil wizard could bypass things like a paladin's Divine Sense or Protection from Evil and Good?

 Divine sense, yes. Wouldn't work on Protection from Evil and Good as it applies only to detection effects - non-divination type magic has normal effects.

 I think the last line of the spell is the most important, "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.". That answers most questions IMO

 I think the last line of the spell is the most important, "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.". That answers most questions IMO

Quote from Emeraldnickel >>

Quote from lexoheight >>

 If I'm reading this right, with the Mask part of the spell an evil wizard could bypass things like a paladin's Divine Sense or Protection from Evil and Good?

 Divine sense, yes. Wouldn't work on Protection from Evil and Good as it applies only to detection effects - non-divination type magic has normal effects.

 The spell specifically calls out Symbol, though, which is abjuration, yes?

Not quite right. The last line of the Mask effect:

> 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.

Technically, any spell that only affects certain creature types is detecting what creature type they are as it tries to take hold. That last line doesn't say anything about it only affecting certain types of spells, and the first line of the effect is vague enough that it gives a non-spell effect and an abjuration spell.

The way I'm reading it, it specifies spells and magical effects that Detect auras and creatures. It wouldn't effect if a spell could target a creature of a different type. So divinations spells could be fooled, but you couldn't cast Planar Binding on a humanoid creature.

Quote from AshtonSurespell >>

The way I'm reading it, it specifies spells and magical effects that Detect auras and creatures. It wouldn't effect if a spell could target a creature of a different type. So divinations spells could be fooled, but you couldn't cast Planar Binding on a humanoid creature.

 I would agree that rules as intended, it's not meant to be used with things like planar binding, but whether something "detects" creature types can be quite vague, if its effects differ between creature types, then I would say it detects the creature's type. Some spells like Cure Wounds may have no effect if the target is undead or a construct, which seem like it's based more on those creature types not being able to be healed by normal means, but the existence of universal heal spells like Aura of Vitality makes it seem like those healing spells are just designed to discriminate.

OK, so RAI you can't use Cure Wounds on a construct or undead, BUT "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" so RAW you SHOULD be able to do it. 

This ALSO mean you can use items that require a specific alignment without actually being of that alignment. 

Ok, this is an odd question.  It clearly states that spells treat the target creature of that type or alignment. 

So if say the player has masked their chaotic alignment with a lawful one and want to attune to a magic item that requires the character to be lawful.  

Nothing goes into how magic items know their users alignment, it simply eludes that the character must be "lawful in alignment" such as a Sword of Answering (DMG pg. 206) or such. I rule that the attunement process is more in depth and the item isn't simply doing a detect alignment but a deep matching of values.  

Can I use the fact that it does not include items or objects in the list of things that detect creature types as justification?

Quote from Jason88180 >>

Ok, this is an odd question.  It clearly states that spells treat the target creature of that type or alignment. 

So if say the player has masked their chaotic alignment with a lawful one and want to attune to a magic item that requires the character to be lawful.  

Nothing goes into how magic items know their users alignment, it simply eludes that the character must be "lawful in alignment" such as a Sword of Answering (DMG pg. 206) or such. I rule that the attunement process is more in depth and the item isn't simply doing a detect alignment but a deep matching of values.  

Can I use the fact that it does not include items or objects in the list of things that detect creature types as justification?

I think the rules are very ambiguous on this point and what you've said is a valid interpretation, but so is saying that attunement restrictions are a "magical effect" and therefore this spell would fool them. It's the kind of thing that's very much up to the DM to resolve.