The Auca don’t seem to have much in the way of benevolent Gods. So they tend not to bother with temples or worship. They’re mostly trying to keep a low profile and not be noticed.
But PILLAN is certainly hard to miss. He’s a Volcano God with all the associated Thunder, Fire and Noise and Lightning. During war he scoops up dead chiefs to use in his volcano factory, and the ash of warriors are used in his cloud formations.
For these people, going south was bad news. But by moving north it was just possible the tribe might have a small victory to celebrate.
If things are going too well, PILLAN has control of the spirits called HUECUVUS to shake things up a little.