The hozen of the Kun-Lai mountains are unusually aggressive, even by hozen standards. Food and supplies are often scarce in this hostile terrain. When times are hard, the hozen leadership may declare a "ravage" on nearby settlements.
During a ravage, every hozen strong enough to walk joins in on a massive swarm attack on nearby villages. In this way, they either acquire enough food to last the winter, or they lose enough of their weakest to ensure their current supplies are enough.
For years, the Shado-Pan and grummles have maintained an uneasy peace with the hozen in exchange for food tributes. Fear of the Shado-Pan keeps the local tribes in check... Usually.