The Teshi Nurturi are strange creatures that look like eggs but contain a thriving colony of pseudo bacteria. This colony is semi-sentient, and to the people of the planet Yav'Gara, the Teshi Nurturi is the perfect first pet for any child as it is simple to take care of, needing only some sugar water and a bit of dirt once a week. In Yav'Garan culture, they are seen as a symbol of growth and prosperity, and it is a common tradition to gift one to a newborn or a young child. Some families even raise a Teshi Nurturi alongside a child, believing that if both reach adulthood, they will share a deep spiritual bond.

The pseudo bacteria inside the egg-like structure are special in several ways. Firstly and most usefully for the rest of the civilized galaxy, they are universally ingestible. Secondly, given an appropriate interface, the pseudo bacteria can act as a semi-stable form of biological-digital storage medium, allowing data to be stored and retrieved in a way that surpasses most synthetic storage solutions. Lastly, they never stop growing. So long as they are appropriately fed, the Teshi Nurturi will continue to expand. The capital city of Yav'Gara holds the current record with a Teshi Nurturi that is nearly sixty feet tall and weighs several thousand tons. In some rural areas, people have cultivated them into structural supports and even entire dwellings, hollowing them out while keeping the bacterial colony intact.

The lifecycle of the Teshi Nurturi, when left alone in nature, is rather simple. The pseudo bacteria hatch from a strange mix of egg sack and shell and immediately start consuming any nutrients they can find. As they metabolize these nutrients, their waste products form the creature's shell. After the first six weeks of life, the Teshi Nurturi is roughly the size of a small chicken's egg. At this stage in the wild, other creatures commonly consume them. A reaction between the pseudo bacteria and digestive fluids causes the formation of a new egg sack, which is excreted, and the cycle begins anew.

Several theories suggest that the pseudo bacteria that hatch are identical to the ones consumed, implying a form of biological reincarnation. Others believe the Teshi Nurturi is the longest-lived organism ever discovered, with its bacterial colony continuously regenerating over millennia. While neither theory has been definitively proven, both have passionate supporters, particularly among eco-activist and fringe scientific communities.

Beyond their cultural and theoretical importance, the Teshi Nurturi has numerous scientific and technological applications. Their pseudo bacteria are a powerful probiotic, aiding digestion and immune system health across many species. Some corporations have even experimented with them as living batteries, harnessing bioelectricity generated from their metabolic processes. More controversially, they are being studied as potential medicinal treatments, as certain strains show promise in regenerating tissue and extending lifespans. Furthermore, rare specimens have exhibited unexpected mutations—such as unique shell patterns resembling text or glyphs—which have intrigued researchers at the University of Yav'Gara.

In the modern world, the Teshi Nurturi is a universal food staple. Massive farms accelerate their growth using specialized fertilizers, artificial hormones, and amino acids, producing vast quantities to feed the galaxy. Chefs and culinary experts have also found that varying the nutrients provided can create Teshi Nurturi with distinct flavors, leading to gourmet variations prized in high-end restaurants.

Legends speak of an ancient Teshi Nurturi hidden deep in the Yav'Garan swamps—one that has been growing for centuries and may have developed true sentience. Known as the "Great Sleeping Nurturi," it is rumored to be the size of a mountain, and some believe it is the guardian of the planet’s ecosystem. Meanwhile, reports of unusually large or strangely behaving Teshi Nurturi have led to strict planetary export regulations. Smugglers and black-market dealers often try to transport them off-world, where they are in high demand for their unique properties.

The planetary government and the University of Yav'Gara ask that any anomalous behavior be reported to them immediately and any specimens that fall outside what is considered normal be returned to Yav'Gara for study.