Sarith Kzekarit was a cartographer for the drow from a noble family that had fallen from grace. Once a proud example of drow opulence, House Kzekarit spent itself into irrecoverable debt long before Sarith was born and he grew up  in what could charitably be called modest conditions. Being subject to the condescensions and indignities of relative poverty had a profound effect on him, doubly so as a male in a matriarchal society. He wanted more and swore when he found his fortune, he would never be looked down upon again. He was driven and studious, and showing a gift for memory and spatial proportion, he went from apprentice cartographer to one of the most gifted in Menzoberranzan. It was then that the offers came in and House Kzekarit began to regain a degree of esteem, but in true drow fashion, not all of the offers proved legitimate.

Slavery is the cornerstone of drow society and knowing the location of a settlement, its borders, and the areas its people can range is essential to the safe and profitable nature of slaving raids. His most common requests involved evaluating older maps with modern reports to provide updated locations and information on vulnerable societies and Sarith had no moral objection to this. Nor did he have a moral objection when refugees and representatives in the cities sought him out in secret to bribe him in exchange for omitting them from his maps. Even slaves that managed to sneak away for a day with their masters' property could gift it to him if it fetched a high enough price the black market. One such bribe came from a drow festering with sores, sickening in its deformity with a glazed look behind its eyes. Sarith was repulsed, but the payout was good: precious gems beyond count, if a bit crusted over with fungus. The deal was to omit Neverlight Grove, the center of Myconid civilization in the underdark. The Myconids, strange of mind and slow to adapt to slave conditions, were of low priority anyway. Sarith accepted, and in trying to clean the gems, he eventually succeeded though the spores from them became affixed to his hands as he scrubbed and his face as he breathed in.

The bribes would eventually be his undoing as slavers from House Mizzyrym stumbled right into an ambush from their would-be prey were nowhere to be found on the map. Conspiring for revenge, they framed Sarith for the murder of the drow merchant Nulnida Faen Tlabbar. It was killing two birds with one stone, disposing of an up-and-coming daughter of a rival house and punishing Sarith for his deception, pocketing any money from selling him, probably to one of his marks to be tortured for his treachery. What House Mizzyrym didn't expect was that Sarith would become a web-runner, swept up in a jailbreak staged by some of his fellow prisoners. It seemed Sarith was becoming an accessory to a romantic tale of redemption and rebellion, even if he had no regard for his newfound companions and simply didn't want to die. The problem was his spores.

Worsening throughout his imprisonment, his spores are more prominent as it dawned on him that the sores he had seen on the Neverlight Grove briber had been the result of an aggressive fungal infection. Compelled to scratch and relieve the itch of this growth, he only succeeded in spreading it. After the web runners' watch duty failed to notice an ochre jelly, things only got worse for him. Dissolvingan arm and a leg along with a third of his flesh, Sarith went from afflicted to deformed and in constant agony. The party's artificer, feeling guilty for his failure to spot the threat and concerned for the party nearly losing its navigator, crafted him a prosthetic leg. Sarith begrudgingly accepted, cursing him all the while, but his relief would come from an unexpected source. His burns would scab over with the rampant acceleration of fungal growth over dead tissue, to the point he almost welcomed this as an alternative to the pain. More concerning were the rest of the changes.

The first was subtle but undeniably strange. Sarith found himself capable of speaking to the Myconid child Stool telepathically without Stool's own rapport spores. The child tried to calm Sarith, but disquieted at the development and convinced the child if anyone could offer insight into his condition, Sarith was uncharacteristically friendly to the creature, one he would've dismissed earlier as a freak. His self-interest almost began to resemble a certain protectiveness for Stool, but this always bordered on fear for Sarith as his suspicion grew that the boy was somehow responsible for the worsening of his condition.

When Sarith later fell into the Darklake, thrown from the boat, he was horrified to find he no longer needed to breathe. By the time they reached Gracklstugh, he quietly discovered he no longer needed to eat and food lost all taste for him. The pain of his skin had disappeared as his nerves became frayed and rebuilt as an abomination he was to afraid to contemplate. He was nearly taken by the unsettlingly jovial myconids in the Whorlstone Tunnels as the party sought to stop the Gray Ghost thieves' guild. The attempted to give the party the gift of their lady, the "Great Seeder" to hear them tell it, but out of spite and hatred more than loyalty, Sarith shouted for the others not to accept. The myconids were not offended and entranced Sarith against his will, sprouting a new arm and leg from the latent spores of his arm and starting to dance away with him and his new body. It was only the quick intervention of the web-runners that saved his life, though he survived... changed.

Sarith no longer felt emotions as strongly as he had before, though the bestial traits of disgust, hatred, and fear still lingered as his brain chemistry transformed into something alien and unwelcome. Nevertheless, with his new arm and leg, he found himself revitalized, weaponizing his spores for the good of the party out of spite to whatever entity made him this way. If it truly was the Great Seeder who sunk his hooks into him, he would vow to never obey her will and live free as himself for the rest of his days, haunted by the fact his sense of self was a dimmer concept than it had been before this all began. By now, pain was a memory.

After the party had saved his life, in his first act of gratitude and selflessness, perhaps in his life, Sarith volunteered to draw a map for the party to help them find their way safely to the Blingdenstone. From there, if anyone, the deep gnomes could help them return to the surface. He reasoned he may as well go with them: Sloobludop was destroyed, Gracklstugh despised him, Menzoberranzan was forever lost to creatures such as he, Neverlight Grove meant almost certain death, so why not try life among the gnomes? What else was there? He would map a path to the Grove for the party to return Stool and Rumpadump home, but he himself would only follow them too Blingdenstone. Alas, it was not to be that simple.

With unspeakable dread, Sarith discovered that his subconscious had led them straight to Neverlight Grove as the last of his resistance was crushed by the song of his new people, the disciples of Zuggtmoy. Now a prisoner in his own mind, Sarith melded with the infected Myconids, becoming a plantlike monstrosity and was overcome with the desire to spread the unconditional love, joyful haze, and death of the self to his old party. Fighting alongside Yestabrod, Sarith died a slave of the Demon Queen of Decay, never to be saved but perhaps to be avenged.