Source: Lord of the Black Sands, pg(s). 84
Vitalias look like giant, blood-red jellyfish, but also resemble pulsing hearts trailing open-ended, bleeding veins.
Most vitalias come into being from accidental combinations of occult magic, rare alchemical reagents, and large quantities of spilled blood. The creatures cannot survive long outside of blood, similarly to how fish cannot survive outside of water. Consequently, vitalias are typically restricted to the place of their birth.