[KaVir]

In GodWars1 there was a mogwai-like creature who would follow players around and beg for food. If you fed him, he'd turn into cocoon which would eventually hatch into a gremlin. The gremlin would then hunt and eat other mobs, laying eggs which hatched into stronger gremlins, and those gremlins would do the same again. The third and strongest generation of gremlin would lay small crystallised eggs which could be collected and eaten for bonuses (a bit like potions).

Some players would take the mogwai creature to an isolated part of the mud, seed the area with food, then come back later to "harvest" the small eggs. I guess you could consider that a form of farming.