When a creature in the world of Iozaria dies they need to be guided to the plane of their patron, which is what is the duty of Mova. Creatures who perish on the material plane gets visited by Mova not long after the passing, and is often given a choice of being able to return to their world by effect of a resurrection-type spell, or they can choose to move on to the plane of their deity. Any creature that does not have a strong connection to a deity end up in Hades, but a strong willed soul, often those with unfinished business can roam the Astral Sea for as long as it desires. Visitors to the Astral Sea may even encounter some of these lost souls if they are lucky enough, giving a chance to meet their fallen friends if luck allows it.
If somehow a soul is not visited by Mova in time, they might be affected by an outside influence and trapped in the body. Doing a ceremony can call Mova to the body to give the soul it's rest. If a soul is trapped in a body for too long it can become restless and release itself as a hostile entity, such as a ghost, banshee, or if Mova permits, rise again as a revenant to finish it's last mission. Most funerals are done to make sure that the soul is given its choice by Mova.
Any creature that have been dead for no more than a minute simply needs a simple nudge from Mova to be jolted back to life, but longer than that, the soul departs the body and enters the Astral Sea, to wait for guidance from Mova, to either be asked back to their body if there is a resurrection ritual, or the soul can choose to move on.
