Ten Ten-Vilu or Trentren-Vilu (from Mapudungun: Trengtrengfilu; Trengtreng, a name, and filu, "snake") is the Mapuche god of earth and fertility (or goddess in some versions found in Chiloé); he has a generous spirit and is the protector of all life on Earth, and the flora and fauna and according to some Mapuche myths (later also found in Chiloé).
The legend tells that the son, or daughter (in other versions), of the spirit Pillan Antu wanted the power of his father.
When humans did not show gratitude for what the spirits gave them, Kai Kai-Vilu and evil spirits attempted to eliminate them by raising the waters to drown and assassinate them, but Ten Ten-Vilu raised the earth and began a titanic war, creating (in effect of the elevation of the sea and the mountains) the archipelago of Chiloe.
That is why now when Kai Kai-Vilu raises the water, Ten Ten-Vilu moves the ground (this last narrative explains why earthquakes and tsunamis occur).
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