The ancient peoples believed in spirits that existed in everything around them. By appeasing the spirits, they could convince them to help, while angering them would bring a calamity. In the Unreal World, some rituals can appease them, the most obvious being ones involving sacrifice. Another way to appease them is to sacrifice iron weapons in a bog. To do so, wait until night time and throw an iron object into a pool of water in a bog. This is one of the tasks in the Advanced adventures course.
In older versions, appeasing the spirits was important, as they would send dangerous animals next to you if they were angry, or even things such as forest fires and plagues. However, in the current version 3.12b, the spirits appear to be nerfed and cannot do anything, whether good or bad. They do not even have to like you for you to learn new rituals.