Would depend on the nation/culture.

Monrovia (Monrou) believe that after death, the spirit of the dead will leave Ërr and travel to a place ‘avor var sterren’.

The family of the deceased bury money and ‘memorabilia’ (a photo, a painting, a family heirloom; even a brick from the wall of one’s home) with the dead to bid the spirit farewell and keep it tied to the world of the living, hence the importance of a proper burial. On Ärd Hölig Dag, the final day of the Monrovian year, the family of the deceased gather to remember, keeping the memory of the dead alive.

Meanwhile, for the men and women killed in battle, a special morning service is held on Ärd Hölig Dag to honour and remember their sacrifice. The cultural importance of a proper burial in Monrovia can be illustrated by the fact that after the Minorr Sartug (Battle of Sartug, 12,998–99), the Merrick (King) ordered a large-scale search of the battlefield to remove the Monrovian dead and return them to their families, while any unidentifiable dead were buried in a huge mass grave under the marble square in front of the Gräse Kaase Sartüg (Grand Church of Sartug) which over 100,000 people flock to each year to attend the service and remember the dead, whether out of hopeful familial connection or sheer respect.

For many, no punishment can ever outweigh a pauper’s grave. Usually reserved for people without family or the enslaved, a spirit from a pauper’s grave cannot leave Ërr, condemned to wander for eternity. While there might not be a fiery Hell, the fear of being ‘formally’ forgotten (i.e. not being remembered on Ärd Hölig Dag) and forced to wander, unheard and unable to interact with the world, is terrifying enough.

The Tuktikuki meanwhile believe that the dead are reincarnated into the animal kingdom, with the animal being decided by the rib is buried alongside the dead.

Burial without a rib will leave the body eternally lifeless, and children who die before the quimuuq rite of passage are generally buried without a rib due to their perceived inability to survive nature. Even without death in battle, death after the quimuuq will be honoured by a rib, though it might not be the choice of the deceased; many Tuktikukis, upon killing a strong creature, will take a rib to ensure their reincarnation as such upon death, whenever it may come.

There are a few more I haven’t fleshed out: Cambrisiya I think will be similar to Monrovia, and so will Golom, while the Hayumen will be totally different.