As @boztakang said it's what the trolls do, but not just trolls, many other cultures too. Sartarites and Praxians certainly do this as their ancestors are important to them, and they were at many historical/mythological events and can tell about them first hand. There's actually a bit in one of the recent adventures that alludes to this - you meet an ancestor that has been forgotten (can't remember the exact detail on this). Like trolls they also tend to remember the important stuff - Slights, Grudges, Feuds, spells, and why you should listen to what your grandfather said. In Sartar, Daka Fal is much more widely acknowledged that current publications suggest. This has been an ongoing discussion with @Jeff. There will be a paragraph on it either for the next WF or the Prax book. The Praxian ancestors are in spirit form they have a only slight material form and fight with magic weapons and the like, attacking the very souls and spirits of their foes. Only rarely does an an ancestor take on a body and even then it's that of the family shaman. When a Praxian cultist dies, their spirit goes to the Great herd ruled over Waha and Eiritha, after an undetermined time they enter back in to the cycle of life and their spirit is reborn again. It is while they are in the Great Herd they may become a cult spirit, source of a charm, etc. They have died, their body is gone and their spirit/soul is separated. They have not avoided death.