So it's [Magic Aura](https://aonprd.com/SpellDisplay.aspx?ItemName=Magic%20Aura) for tricking occult classes. This is one of the dozen or so hoops a criminal will need to jump through if there might be a psychic detective around for some sort of murder mystery event, alongside making sure the dead body doesn't know anything in case of Speak With Dead, that you burn all the plants in case of Speak With Plants, using Modify Memory on anyone who saw you, etc... (Basically, you can't just put an Angela Landsbury novel into Golarion and expect it to work when forensic divination magic blows CSI "zoom in and ENHANCE" magic out of the water.)
It takes a full minute, so this is something you do only when you're spending a *lot* of time cleaning up the crime scene afterwards and want to plant evidence to frame someone else for whatever you did. (Otherwise, just take the evidence with you or destroy it.) The psychic trying to read information won't get true information if they succeed on the save (and you're trying to make a psychic fail a will save, mind you), but they'll realize someone is planting evidence, which may screw up the plot.
This is generally a plot spell, good for GMs who want to set up murder mysteries for the party and actually keep the setting's magic in mind, but players may theoretically have ways of using this if they're *especially* devious and know there are psychic investigators around (or better yet, are one and can get themselves called in to solve their own crimes and pin the blame on someone else while maybe having only an amateur try to follow up and agree that the false information was there), which can be highly useful for social engineering in social campaigns. Most general dungeon-clearing campaigns won't have time for bothering to hide how blood-soaked the PCs are, however.
Really your murderer needs to be disguised (preferably with a mundane disguise check) and invisible for the crime, the very ground is a witness after all (stone tell).
Effectively any murder needs to be done in such a manner that someone in the room looking at the victim when it happened couldn't trivially solve it.
Yeah, the most basic thing you need is just a mask or even just a sack over your head. Disguise checks are really only needed to look *like someone* or just pass as a particular race, but just covering your face should be simple, and Alter Self is relatively foolproof. Speak With Dead is also explicitly cryptic and Speak with Plants or Animals or Stone Tell are going to have even more trouble saying anything other than "It was Red Mask" if you just toss a luchador mask on. (And vigilante, especially, has a benefit to throwing people off.)
Beyond that, of course, the disguise itself is evidence, as is the murder weapon, although whether you want to destroy them or not can create other evidence. (If you put in a lot of orders for red luchador masks at the local seamstress because you burn old ones after a single murder, she might get a little sus when she hears about murders by a "Red Mask". Trying to silence her just creates another murder investigation that will leave its own evidence. You're honestly better off doing your crimes with Modify Memory and Charm Person than murder in Golarion, it's such a pain to evade investigations, while crimes unnoticed never get solved.) Stashing your murder attire and weapons instead of destroying them can also be targets of other divinations, however, if someone wants to Locate Object after they somehow get a glimpse of the red mask in question. You might keep them in a lead-lined box, but having to move the bed to pull up the floorboards to get to the lead-lined box in the foundation of the house might just leave some witnesses who might start a rumor, too... but then, that's the kind of breadcrumb trail that's just long enough for a mystery for the PCs to follow...
Pure NPC spell, specifically it's for GMs who don't want a player with Object Reading or Psychometry to find stuff out.
Probably because you've got an occultist, since I certainly can't imagine anyone actually putting ranks in Appraise for the skill unlock.
Even if they pass the save they still don't get any useful information, so it's very reliable.
So it's [Magic Aura](https://aonprd.com/SpellDisplay.aspx?ItemName=Magic%20Aura) for tricking occult classes. This is one of the dozen or so hoops a criminal will need to jump through if there might be a psychic detective around for some sort of murder mystery event, alongside making sure the dead body doesn't know anything in case of Speak With Dead, that you burn all the plants in case of Speak With Plants, using Modify Memory on anyone who saw you, etc... (Basically, you can't just put an Angela Landsbury novel into Golarion and expect it to work when forensic divination magic blows CSI "zoom in and ENHANCE" magic out of the water.) It takes a full minute, so this is something you do only when you're spending a *lot* of time cleaning up the crime scene afterwards and want to plant evidence to frame someone else for whatever you did. (Otherwise, just take the evidence with you or destroy it.) The psychic trying to read information won't get true information if they succeed on the save (and you're trying to make a psychic fail a will save, mind you), but they'll realize someone is planting evidence, which may screw up the plot. This is generally a plot spell, good for GMs who want to set up murder mysteries for the party and actually keep the setting's magic in mind, but players may theoretically have ways of using this if they're *especially* devious and know there are psychic investigators around (or better yet, are one and can get themselves called in to solve their own crimes and pin the blame on someone else while maybe having only an amateur try to follow up and agree that the false information was there), which can be highly useful for social engineering in social campaigns. Most general dungeon-clearing campaigns won't have time for bothering to hide how blood-soaked the PCs are, however.
Really your murderer needs to be disguised (preferably with a mundane disguise check) and invisible for the crime, the very ground is a witness after all (stone tell). Effectively any murder needs to be done in such a manner that someone in the room looking at the victim when it happened couldn't trivially solve it.
Yeah, the most basic thing you need is just a mask or even just a sack over your head. Disguise checks are really only needed to look *like someone* or just pass as a particular race, but just covering your face should be simple, and Alter Self is relatively foolproof. Speak With Dead is also explicitly cryptic and Speak with Plants or Animals or Stone Tell are going to have even more trouble saying anything other than "It was Red Mask" if you just toss a luchador mask on. (And vigilante, especially, has a benefit to throwing people off.) Beyond that, of course, the disguise itself is evidence, as is the murder weapon, although whether you want to destroy them or not can create other evidence. (If you put in a lot of orders for red luchador masks at the local seamstress because you burn old ones after a single murder, she might get a little sus when she hears about murders by a "Red Mask". Trying to silence her just creates another murder investigation that will leave its own evidence. You're honestly better off doing your crimes with Modify Memory and Charm Person than murder in Golarion, it's such a pain to evade investigations, while crimes unnoticed never get solved.) Stashing your murder attire and weapons instead of destroying them can also be targets of other divinations, however, if someone wants to Locate Object after they somehow get a glimpse of the red mask in question. You might keep them in a lead-lined box, but having to move the bed to pull up the floorboards to get to the lead-lined box in the foundation of the house might just leave some witnesses who might start a rumor, too... but then, that's the kind of breadcrumb trail that's just long enough for a mystery for the PCs to follow...
Pure NPC spell, specifically it's for GMs who don't want a player with Object Reading or Psychometry to find stuff out. Probably because you've got an occultist, since I certainly can't imagine anyone actually putting ranks in Appraise for the skill unlock. Even if they pass the save they still don't get any useful information, so it's very reliable.