Log of the Artifacts in my playthrough and what they did in each world:
Flavor Text: Y dyddanat lyntpuynt puug vemmat fedr cekhydinac fedr yh unhyda canev '1' aspuccat uhdu ed. Ouin cekhydina ec ymnayto eh ed. Oui tu hud nasaspan ouin hysa. Hu uha tuac. Oui yna uhmo BMYOAN.
Effect: Started off the "Cultist of the Nameless One" sidequest.
Mirror World Effect: ???
Plot Consequences: [REDACTED] signed it in my playthrough and got a lot of buffs to bluffing in any Cult scenes. There was some consequences to intra-party relationship scores, though. We never reversed it so we didn't find out what it did in the Mirror World.
Flavor Text: Y vylamacc draydan sycg fedr y 2 uh dra ehceta uv dra vunarayt. Oui lyhhud cdub dra CRYSPMEHK RUNNUN FEDR HU VYLA dryd cdymgc oui. Ajah ev oui syo pa ypma du tecnibd dra TIU SYCG eh dra naym Wysbyheu, oui lyh hud rana. Ed ec ouin ufh vyimd.
Effect: If you wear the mask you can make a copy of any person you see that is a SHAMBLING HORROR. The HORROR appears as a FACELESS MANNEQUIN, though can assume any form (save that of their original) to accomplish any goal you give them on golden tokens.
Mirror World Effect: Any SHAMBLING HORRORS currently spawned take on the appearance of their originals and attempt to stalk, kill, and replace them. They have an alternate, monstrous form that is still somehow clearly the original as well. Once a SHAMBLING HORROR has replaced their original they will calmly behave more or less as their original would have, with the caveat that they will obey any orders given by the Wearer of the Mask.
Plot Consequences: The Mysterious Stranger (revealed to have previously been Watt Mark W post-Octome wiping) wore it to make copies of the party, as well as low level enemies for them to face. When reversed, most of the party killed their SHAMBLING HORRORS, though [REDACTED] voluntarily gave what was left of his identity to his SHAMBLING HORROR, thus having both [REDACTED] and Joshua in the party at once.
The Mirror World uses it to create a perfectly compliant populace. If you refuse to conform, they can replace you with someone who will.
Flavor Text: Y cesbma kmycc semg puddma fedr y 3 aspmywuhat uh ed. Fryd ryja oui ymnayto vunkuddah?
Effect : If you write a concept on a scrap of paper and stuff it into the bottle, no one *anywhere* but you will be able to remember this exists. This can be as broad as "bananas" or as specific as "what happened the night of this murder".
Mirror World Effect : If you fill the bottle with liquid and dissolve all paper/ink inside then everyone will be aware of the concepts previously contained within it as "general knowledge" (even if they hadn't known about it before).
Plot Consequences: The Cult of the Nameless One tried to keep Mr Lovettes robbery a sufficient Mystery (despite how much evidence they intentionally left behind) using the Tres Bottle.
The Mirror World uses the Bottle as a means to rapidly disseminate information, propaganda slogans and notices from the Association to its populace.
Flavor Text: Y timm cdnyekrd nywun cdyehat fedr pmuut, y hispan 4 ec adlrat uhdu dra ceta uv dra pmyta. Ulayhc uv pmuut myb yd ouin vaad pid oui lyh hud ghuf ed.
Effect: Any wound made by the Quatro Blade is completely unnoticeable, even by the wielder or victim. If a wound is deep enough, the victim can bleed out all while being confused as to why they suddenly feel so "tired" and non specifically achey. Should the victim die, they are no longer noticeable.
Mirror World Effect : Reversed, any injury, disease or similar on a victim wounded by the Quatro Blade is EXTREMELY OBVIOUS and the wielder knows *exactly* what caused it and how best to treat it. Any previously hidden blood or corpses is now visible and extremely hard to ignore.
Plot Consequences: Apparently there was an ENTIRE serial killer side quest we missed because we never caught the killer. By the time we reversed the Quatro Blade there were corpses and blood *everywhere* "suddenly". On the plus side it REALLY helped convince the populace that the World Was Ending, but on the negative side it was NOT worth the insanely high panic score we had to deal with as a result.
In the Mirror World the St Bleeding Hospital was founded using copies of the Blade to make small cuts on patients to diagnose and come up with a treatment plan for wounds (as well as solving violent crimes). The Original Blade is used only for extreme cases.
Flavor Text: Y cesbma sydda pmylg lmuyg fedr y 5 aspnuetanat uh dra pylg eh creho pmylg drnayt. Tu oui fuhtan fro oui yna ymuha?
Effect : Wearing it permanently erases your bonds with anyone, and prevents you from being anything more than an "acquaintance" with anyone ever again. In game effect is to dissolve your party and switch to solo play.
Mirror World Effect : When reversed, permanently causes anyone who ever knew you to feel at LEAST as strongly about you as if you were a childhood companion (for good OR for bad).
Plot Consequences: We didn't encounter it in the main world, but in the Mirror World it is how the Association kept everyone at "small town" level of cooperation despite having billions of people.
Flavor Text: Y rekrmo bumecrat pnycc caqdyhd. Drana ec y 6 lynjat uhdu dra syeh ghup. Fryd mingc zicd uid uv ouin ypemedo du cahca?
Effect: When activated, the Sextant kills everyone but the wielder in a six foot radius. In exchange, the wielder and anything they are touching is completely undetectable by any means until the Sextant is deactivated (while in contact with the undetectable object). Anything affected that is more than six feet big will have only six feet of it affected.
Mirror World Effect: When reversed, anything previously affected by the Sextant is now HYPER REALISTIC, easier to see/taste/smell/feel/etc.
Plot Consequences: Tobin Conner's death fueled the theft of the Sextant. Additionally, the Judge's ability to "Already Be There" during an arrest is presumed to be related to this.
In the Mirror World, there's a mafioso owned restaurant that murders enemies and uses that to create the most flavorful pasta you've ever tasted.
Flavor Text: Yh umt pnuhwa lueh. Drana ec y draydan sycg uh uha ceta, yht y 7 uh dra udran. Oui fuimt hajan ghuf ev ed fana rihdehk oui.
Effect : Anyone holding it is considered to be unremarkable and perfectly normal and expected for wherever they are.
Mirror World Effect : When reversed, anyone holding it will stand out horribly in crowds and be extremely obviously out of place.
Plot Consequences: It turned out that the Judge had this coin at all times (besides one scene), which is why he was so unremarkable. You could not remark on him. [REDACTED] had used it to try to steal the OCTOME as well, which is why he wasn't caught even after the bodies were discovered (even though people can recount him as being at the scene no one considered it weird).
In the Mirror World, visitors are required to hold coins minted from the Septum Coin, which have a dulled version of its effect, so that the Association can "keep an eye" on them in particular.
Octome :
Flavor Text: Y lnispmehk maydran puug fedr caasehkmo mydeh clnebd, fedr saccemo dunh bykac. Drana ec yh 8 aspuccat uhdu dra pylg. Frah ed lydlrac oui drana femm pa hudrehk mavd du nasaspan oui po.
Effect: When activated, everyone within 8 feet is killed besides the wielder. In exchange, NO written information can exist about anyone within its radius. This includes past documentation, as well as anything in the future. Text will simply fail to appear on pages as you write it.
Mirror World Effect : When reversed, causes all information hidden by the OCTTOME to be INCREDIBLY EASY to find. People will find themselves drawn to wherever it is, and it will somehow always end up in an easily accessible location.
Plot Consequences: It being accidentally activated by [REDACTED] is what killed the previous Skunkworks team and erased all records of what cases they'd worked on. A separate accidental activation erased Watt Mark W's harddrive and lead to him being recruited into the Cult of the Nameless One.
Flavor Text: Yh unhyda pid dynhecrat cemjan sennun, fedr y 9 lynjat uhdu dra pylg. Ed ec cyet du navmald ajanodrehk pid vylac. Yna oui landyeh oui ryjah'd ymnayto paah lyikrd?
Effect: When activated, anyone within a 9 foot radius can no longer have SUFFICIENTLY ACCURATE PICTORIAL REPRESENTATIONS made of them. This includes photographs, drawings, videos, anything visual. Additionally, anyone who attempts to make pictorial representations of them will gain the effect themselves, ad infinitum.
Mirror World Effect: When reversed, anyone previously affected by the Mirror is EXTREMELY easy to document pictorially. CCTV cameras swivel to follow them. Tourists with cameras find themselves inexplicably drawn to take their picture. Bored artists sketch their likeness.
Plot Consequences: Penny took a picture of Mr Lovette, who was directly affected. She, in turn, was photographed by Mr Whately. By the time the world started ending most citizens no longer appeared in photographs.
In the Mirror World, all citizens are afflicted, to encourage sufficient crowd sourcing of surveillance.