Why: The internal name for this sextant is MapAtlasFishy.
Your Maps Are Alluring (previously: Areas are Alluring) is a very rare voidstone sextant modifier found on Awakened Sextant. With current sextant blocking it takes 1821 sextants on average to land it.
There is at least one undiscovered effect from the Areas are Alluring sextant modifier.
Charged Compasses with the Alluring sextant can be traded for, however the mod is named 'Area is Alluring' in the stat filters search interface.
Here are a couple of the known effects of the Areas are Alluring sextant ('mapatlasfishy' in the gamefiles):
An enormous amount of testing has been done with Areas are Alluring sextant, but there are still some undiscovered features of the modifier.
Insanity is a secret condition applied to characters which causes weird effects. There are three confirmed sources of Insanity: Innsbury Edge, Replica Innsbury Edge and the 'Areas are Alluring' sextant mod.
It seems likely that other sources of Insanity exist. Check out this timeline of patch notes:
If the patch notes in 2.3.2 are not just vacuous trolling or future-proofing teasers, that means at least one more source of Insanity exists other than Innsbury Edge and 'Areas are Alluring'.
A large part of general Path of Exile lore involves madness/insanity, and therefore there are many items and events which mention going insane. Oftentimes these references may be completely unrelated to the capital "I" Insanity, the specific secret condition.
A character affected by Insanity experiences weird stuff. These events are all relatively rare.
The list of all possible effects of Insanity are obfuscated in the gamefiles. We do not know if this is a comprehensive list.
These events can occur even while you are AFK. Certain occurrences can cause client crashes. For example, if you idle in your hideout wielding Innsbury Edge and the "doppelganger" effect triggers, your client will crash because that critter type is disallowed in hideouts.
The Insanity message "You hear a sound in the distance." also occurs when you insert disallowed combinations into the map device and spam-activate. This is likely a reference to Nethack's "You hear some noises in the distance".
While Insanity mostly appears to be a zany easter egg, there may be actual hints here as well. Some Insanity effects connect to fishing. It's possible that Insanity and Fishing are actually unrelated, and Insanity merely references fishing as a joke. Take a look at these examples and decide for yourself.
One of the "fake First to Enter" zones is 'The Fishyards'. Another is "Merveil's Dream". There are also "The Coves" and "Sea of Souls", though these are less connected.
The 'Areas are Alluring' sextant mod ('MapAtlasFishy' in the gamefiles) causes Insanity.
Another source we have on record is from Bex, who wrote about certain Krillson dialogue "not yet" being triggered. Interestingly, the very next line in that post after Bex's comment on Krillson is about Innsbury Edge:
Chris Wilson voiced Krillson, Master Fisherman. Some of the dialogue recorded has not yet been triggered in-game. The Innsbury Edge unique sword is named after Innsmouth and Ashbury from Lovecraft stories.
It's a stretch, but that juxtaposition between Krillson and an Insanity item may be another clue.