The Hist are a species of giant spore trees growing in the innermost swamps of Black Marsh. Argonians are known to have deep connections with the Hist, calling themselves "people of the root", and licking the leaking sap of their trunks in religious rites. Others claim the trees are, in fact, a sentient race, more ancient than all the races of man and mer. Hist trees usually have red bioluminescent flowers growing out of them, but the Naga-Kur tribe have blue flowers. One tribe dedicated to ice spells have a Hist that drips with icicles and is said to be located deep within Black Marsh.
In the Argonian language Jel, Hist saplings are refered to as Hist-Deek, mature Hists are called Hist-Dooka, and Elder hists are called Hist-Tsoko. The names of the stages of a Hist's development are also used as months within the Argonian calender.
The Hist trees of Black Marsh, most say, were the original life forms on Tamriel. The Hist were considered bystanders of the war between the Ehlnofey, but most of their realm was destroyed as the war passed over it. It is believed that the Hist acknowledge Sithis' role as the "Original Creator". It is said that all Hist are connected at the root—they speak to each other and to the An-Xileel (though some trees, like the city tree of Lilmoth in the early Fourth Era, may become isolated). In the Third Era, the Hist used their influence to call Argonians from across the Empire back to Black Marsh. Having foreseen the Oblivion Crisis, the Hist (through the An-Xileel) ordered the Argonians to assault the invading Daedra. The Argonians poured into the Oblivion Gates with such ferocity that Dagon's lieutenants had to close them. This resulted in an astounding victory for the Argonians and led to the collapse of the Empire in Black Marsh as the Argonians turned to the An-Xileel.
The Dreaming TreeEdit
The Dreaming Tree, also known as the whispering root , was a Hist Tree belonging to the Root-Whisper Tribe. The Barsaebic Ayleid invaded the tribe's territory and harvested their souls at an alarming rate, and as a response, the Root-Whisper Hist sacrificed itself to create the Remnant of Argon, an amber artifact that could contain the souls of the entire tribe until the Ayleid incursion had passed. The Barsaebic Ayleids attempted to stop it's creation, but were held back long enough for the Remnant to be completed.  The creation of the Remnant resulted in the hist tree being put into a slumber, thus becoming known as the Dreaming Tree.
Although the Remnant of Argon was meant to only be a temporary measure, that was prevented as the Ayleid occupation lasted far longer than was anticipated thanks to Myndhal's obsession. With the Root-Whisper Hist cut off from the rest of the Hists and the Root-Whisper tribe all but dead, there was no clear way for them to pass along the information of the Remnants location. Eventually, all knowledge the Remnant of Argon faded into obscurity, thus keeping the Dreaming Tree in its slumber. It was remembered by the Hists and Argonians of Murkmire as something that invokes 'immense sadness'.
Eventually, a group of historians known as Cyrodilic Collections came to Murkmire on behalf of their Argonian benefactor to collect and preserve ancient Argonian relics. Though their benefactor, Kassandra, seemed to be altruistic motivations at first glance, she secretly hoped that one of the artifacts discovered could finally allow her to become connected to the Hist, something that had been an impossibility for her ever since her birth into Dunmeri servitude. After Cyrodilic Collections discovered both the origin of the Remnant of Argon and the Rootmender's Staff, which could lead them directly to the Remnant, Kassandra betrayed them, stealing the Staff and leaving the rest for dead. Kassandra used the Rootmenders staff and a Vakka Stone to open a portal from the Nexus Realm directly to the hiding place of the Remnant of Argon, with the Soulless One and Famia Mercius giving chase. Kassandra successfully uncovered it and, claiming to finally hear the Hist, was promptly devoured by a Miregaunt. Thanks to her control over the Remnant, however, Kassandra had managed to take control of the Miregaunt and had to be defeated by the Soulless One. Famia picked up the Remnant and carried it to the safety of the now long-abandoned Root-Whisper Village. There, the Soulless One, the Bright-Throat Xukas, and the Naga Jaxsik-Orrn traveled into the Remnant of Argon itself in order to finally lead the lost Argonian souls out and reawaken the Dreaming Tree. In order to do this, one of them needed to stay behind and guide them back at the cost of their life, though it is unclear whether it was the Naga or Bright-Throat that did this. Regardless, because of their sacrifice, the Dreaming Tree was awakened, the Root-Whisper tribe was reborn, and the Remnant of Argon was finally no more.
The Hist of UmbrielEdit
A distinct group of the sentient trees were found on Umbriel. Like that floating island, they originated from a mysterious realm of Oblivion and came to inhabit the realm of Clavicus Vile. In the early Fourth Era, these Hist were split from the realm by Umbra, becoming an integral part of the life cycle on the floating island of Umbriel. Compared to the Hist of Tamriel, these trees slightly differed in appearance; the leaves were too oblate, the bark less fretted, and the smell a bit off.
The Hist of Umbriel were responsible for producing many substances used in the island's kitchens. The trees were interconnected and played an important role in the recycling of souls on Umbriel; in one sense, they were Umbriel. They lived in the Fringe Gyre, an external area of Umbriel located around the edge of the island's surface, although their root system extended down into the lower subterranean levels of the island. They were thought to be drawn to Tamriel from the Void in 4E 40 by the Hist. Annaïg Hoïnart, a Breton who had infiltrated Umbriel and assimilated into the kitchen staff, planned to feed the roots of the Um-Hist poison and cripple Umbriel. Mere-Glim, Annaïg's Argonian companion, felt a connection with the Um-Hist similar to that of the Hist, albeit quieter and vague. After he was reborn as an Umbrielian, Glim felt an even deeper connection, and foiled Annaïg's plot. Following the destruction of the second ingenium, the Um-Hist were responsible with teleporting the island of Umbriel to their mysterious realm. Following the death or departure of many Umbriellians from the grounded island, it is unknown how the Um-Hist adapted to their new environment.
The Sleeping TreeEdit
The Sleeping Tree is a strange leafless tree found in Whiterun Hold in Skyrim. It grows in a misty pool beside a small cave now named after the tree. A giant encampment also named for the tree surrounds it. Several legends exist on the origins of the Tree. Some say that a piece of rock was blasted from Red Mountain during the Red Year and landed in Skyrim, and the Tree grew from the resulting crater. Others say that it grew from a spore which fell from a "floating island", referring to Umbriel, in which case the Tree is one of the Hist of Umbriel.
The Hist is capable of communicating in a variety of methods. The Bright-Throat Tribe's Hist speaks through the wind, and the Bright-throat Argonians create chimes in order to receive its message.
When Hist Sap is licked by an Argonian, the tree is capable of communicating with the Argonian through visions. The sap of the Hist seems to increase the combat prowess of those who drink it. Hist sap has the ability to 'alter' living organisms, which may explain Argonian origins. Ingesting large quantities of Hist-Sap is often dangerous, even for Argonians. The Sap-Speakers of the Miredancer Tribe, known for communing with their Hist and ingesting large amounts of sap in the process, often suffer the effects of sap-poisoning, including "gold tongue" (permanent change of mouth pigmentation to a golden hue), "bark scale" (thickening and darkening of surface scales), and unwanted hallucinations among other symptoms. The Blackwood Company smuggled a Hist tree from Black Marsh to their headquarters in Leyawiin, and extracted the sap to exploit this. However, when consumed by non-Argonian species, the Hist sap had strong hallucinogenic properties that sent them into dangerous bloodlust, though the poor treatment of this particular tree affected the sap causing similar effects on Argonians, as well. At the end of the Third Era, a recruit of the Fighters Guild sabotaged the Hist extraction mechanism, destroying the tree in the process.
- The first edition of the Pocket Guide to the Empire mentions the Hist, though its description of them differs dramatically from that given by other sources. They are described as a relatively intelligent strain of Argonian; repulsive, but peaceful enough to be tolerated outside of Black Marsh. The Pocket Guide also makes reference to their "cherished spore-trees".
- The Argonian Account, Book 4 by Waughin Jarth — Decumus Scotti's continued adventures in Black Marsh, Volume 4
- The Argonian Mating Ritual by Valrendil of the Crystal Tower, Research-Appointee to the Thalmor — Research notes on Argonian mating habits
- From the records of Ah-Tee, Tree Minder by Ah-Tee — An Argonian's concerns for a Hist tree
- The Fruit and the Stone — A tale surrounding the fruit of the Hist
- The Hist's Fire by Pegareem — How two Argonians met
- Letter to Septimius by Junia Severa — An apprentice's research on Black Marsh and the Hist
- List of Instructions by Alchemist Ruuvitar — Instructions and guidance on Hist sap extraction
- The Lost Communion — An Argonian rediscovers a connection with the Hist
- Miregaunts of the Marsh by Kratius Gray of the Black Marsh Exploration Society — An essay regarding the tree-like creatures of Murkmire
- Myths and Legends of the Hist by Cirantille — Details on the Hist of Black Marsh
- On Argonians by Cirantille — A description of Argonians and the Hist
- Pillagers of the Hist — Letter regarding the Dominion's collection of Hist sap
- Pocket Guide to the Empire, 1st Edition: The Wild Regions by the Imperial Geographical Society
- Remember Me — The tale of an Argonian seeking to understand his nightmares
- The Seed by Marobar Sul — Book 2 of an incomplete series of fictional stories about the Dwemer
- A Shallow Pool — A poem regarding the Hist
- The Strange Case of Ja-Reet — The story of an Argonian born away from his people
- The Trials of Hissmir by Sali-Ze, Hissmir Oblate — Advice on offering oneself to the Hist
- The True Balance — How to understand a foe
- Varieties of Faith: The Argonians by Brother Mikhael Karkuxor of the Imperial College — A supplement to Varieties of Faith in the Empire regarding the Argonian belief system
- Pocket Guide to the Empire, 3rd Edition: The War with the Trees: Argonia and the Black Marsh — Imperial Geographical Society, 3E 432
- Chilling Senche-Lizard mount description in ESO
- The Seasons of Argonia — Jekka-Wass Paxalt, Keeper of the Xinchei-Konu
- The Annotated Anuad
- The Monomyth
- The Infernal City — Gregory Keyes
- Jaxsik-Orrn's dialogue in ESO: Murkmire
- Death and Dreaming quest in ESO
- Whispers in the Woods quest in ESO
- By River and Root quest in ESO
- Lord of Souls — Gregory Keyes
- Xukas's dialogue in ESO: Murkmire