Ther, the power of animated life, is the innerent emanation of life flowing from the physical realm to the veil and viceversa from all living things (plants, animals, bacteria and others). All this energy can be drained and used by the so called "Harvester" mages, special beings with the capability of using the power to take this energy and transform it or use it for other things. Most notable, it's used to cure or heal, but it can also be used to kill or resucitate someone on the blink of death.
The power can be gathered and deposited into the Gems of Ther, vidrastones imbued with Ther that allows larger quantities of this energy to be used as one or by several connected mages. The power can also help with harvests and the growing of crops, even in harsh climates or circumstances. This mages are usually popular within most people as they bring health and food to those in need with their power.