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Hermes

Since his intro in 7.2, people immediately wondered if Calyx was a Hermes shard. Here are some interesting points:

Caduceus

This symbol is directly linked to Hermes both in FFXIV and in Greek mythology as his staff.

☤ The Symbol Image Itself

The symbol itself is the biggest stretch imo, but the staff/wing/snake-like pattern around the staff are all present in both designs and they could've been farther apart.

Left: Cadeuceus, Right: Alexandria's insignia, seen on Calyx's shoes and coat

☤ The Symbol's Meaning

It has two meanings and I think both pertain to Calyx. Caduceus is widely considered:

The symbol of a messenger/herald

The symbol of medicine/physicians

We'll dive into these separately. First, the symbol of messengers/heralds. The word caduceus itself comes from the Greek term karykeion, which is rooted in the word "karyx," which literally means messenger/herald.

Written in Japanese, Calyx's name is Karyukusu romanized, which could be simplified down into Karyx. It's basically the same word. So, Calyx's name basically means "messenger/herald" which is what Hermes is known for being, the messenger of the gods.

Secondly, it's very obvious why it's fitting for Calyx to be representative of medicine, given he wears patient scrubs and a physician's coat...which basically makes him representative of medicine as a whole, from both sides.

Responsibilities

Hermes the Greek God obviously has had many interpretations and iterations but something pretty universal is that he is a messenger between god and man, and also helps humans to get to the afterlife.

໒꒱ Messenger of the Gods

I think we can consider him a messenger of godly teachings through Preservation, especially if Halmarut was involved. This also might explain why Demetrius was so obsessed with him and wholly devoted to Preservation: Calyx was literally a herald of the 'gods' to them, bringing technology and ideas that saved and evolved Alexandria.

໒꒱ Guide to the Afterlife

Secondly, helping humans get to the afterlife...that's basically the Endless project, isn't it? Living Memory is his idea of a perfect afterlife for humanity.

Memory Manipulation

In Endwalker, we see that Hermes wielded Kairos to manipulate and erase memories.

Sound familiar?

Regulators used throughout Alexandria have similar functions, such as erasing the memories of someone collectively across society once they pass away.

Hermes / Fandaniel

I'm leaving out comparisons between the FFXIV Hermes himself and Calyx and keeping this to mythological lore. If anyone wants to add comparisons with Hermes from the game, PLEASE DO SO!!! I wouldn't feel qualified until I replayed Endwalker in its entirety looking specifically for Calyx connections (which I very may well do before EC).

Squirrels

Mica the Magical Mu

Though we don't have the complete history of Living Memory, it's clear it was shaped by Preservation's ideas which influenced Endless Sphene, inherently linking it to Calyx. Not only that, but we see him hanging out in Living Memory in 7.2.

And also have our final showdown with him in the Meso Terminal, which is located within Living Memory, where the last of the memories were being stored.

Calyx's connection to Living Memory is important here because the main mascot of the place is Mica the Mu.

Mica is a FATE that spawns in Living Memory, and is also all over Living Memory merchandise and branding.

A Mu is the Final Fantasy equivalent of a squirrel--here is one from FF9 (the game of which all of you I'm sure know was big inspiration for the Ninth, where Calyx is originally from).

As the one behind Living Memory, I think it's acceptable to link Calyx to its main mascot. Especially considering…

Mu Plushie Form

…It's revealed that Calyx has taken on the form of a mu plushie at the end of 7.4.

Though this plush is not Mica himself, it's a Calyx-ified version of it. This directly links Calyx to mus, and squirrels.

Ratatoskr

At NA Fanfest 2026, we got the first trailer for Evercold, along with a lot of concept art. The major influence everyone was quick to note was how much everything seemed to resemble Norse mythology.

In Norse mythology, there is the story of Yggdrasil, the sacred tree. Several animals are mentioned in this story, but the one of note here is the squirrel named Ratatoskr. There are many different interpretations and translations of this story that you can derive information from, but the general gist is that Ratatoskr is known to be a messenger of the tree.

He ferries messages from the eagle at the top of the tree to the dragon at the bottom of it. It's said he's delivering gossip and is stoking the flames between the two to cause drama.

As we already established, Calyx's name in Japanese, Karyx, means messenger. And, now he is literally a squirrel. A squirrel named Messenger in a Norse-inspired expansion...he's definitely got to be Ratatoskr!!

Plus, some people literally consider Ratatoskr to be "the Norse Hermes," because again, Hermes is strongly connected to the idea of being a messenger.

Squirrels in Celtic Mythology

Queen Medb is often depicted with a squirrel and bird on each of her shoulders. The squirrel in particular is a messenger of Earth to the Gods...basically Hermes, again, but switched around.

Squirrels in General

Squirrels have a reputation for gathering up a ton of resources ahead of time and preparing for the Winter. They are so overly prepared that they don't have to hibernate!

Calyx collecting Aether to sustain his Endless for hundreds of years in preparation for the Withering has similarities to squirrel tendencies! Especially because many people consider squirrels inherently greedy or selfish for taking these resources from others (parallels here to how the Scions saw Calyx's plan.)

Heralding at the End of 7.5

At the very end of 7.5, we get an unexpected visit from Calyx with some words about where they're going next, and some implications of the Winterer that's on that shard. Overall, he presents a negative view of the 4th's Winterer.

Obviously I don't know the future, but I have an inkling that 7.56 might give us a scene of Calyx talking badly about us to the Winterer of the 4th...thus fulfilling his role of a pot-stirrer lol. Even if he doesn't, it's still true that he delivered a message to us, at the very least.

Plants and Halmarut

Calyx

A "calyx" is a part of a flower.

It's not the flower itself, but the outer leaves that protect the bud of the flower while it grows and shield it from danger until it's ready to bloom.

The Barrier

We know that Calyx implemented the technology of putting up a dome around Alexandria.

In Tales under the Golden Sun (and 7.4), we find out that Tuphut made a deal with Preservation to get the technology for Treno on the Ninth, as well.

And we see this in 7.4 when we visit Treno.

In a way, the barrier dome is a lot like a calyx, protecting the bud, Alexandria or in this case, Treno!

Plants and Halmarut

Since his introduction in 7.2, folks speculated Calyx would be working with Halmarut the Sower (in charge of fungal and plant life) since he's named after a part of a plant.

Calyx and Simulant Sphene use plant-based words to describe his scheme.

His Necron creation also uses relevantly-themed attacks in 7.3 such as:

Soul Reaping

Crop Rotation

Seasons of Blight

In Conclusion