#sacre

Sacres travel between the upper skies and the ocean underneath using a homing instinct that requires a combination of magnetoreception, infrasound, and smell. They are one of the most numerous lifeforms and are responsible for a vast amount of nutrient exchange. Food from the Abyssal Ocean brings key elements to the Icy Sphere, and plants and lichen the sacres consume in the Icy Sphere contribute most of the organic carbon found in the Abyssal Ocean.

A smaller semi-domesticated sacre species is frequently used to transfer materials between dragon cave systems, phoenix roosts, and other key areas. These homing sacres are most used for temperature-sensitive medicine distribution and are trained to hold their crop at a specific temperature; this is built on a natural sacre adaptation to control bloodflow while in different environmental conditions, as heat loss occurs at different rates in the air versus in water.