Infusion

The Infusion was a main event that happened 15 years prior to the events of the novel. It prevents anyone from dying, being born, or aging; effectively putting the world into a stalemate. Whenever somebody dies, they first enter the Dead World, and afterwards come back to life at a church in a new body. However, undead such as Jim return to the same body after death. Lord Dreadgrave managed to find a way to inflict the Infusion onto those who died beforehand when he rose his undead horde, therefore Jim, Meryl and Thaddeus are affected by it too.

In reality, the Infusion was caused by the developers of Mogworld turning off entropy protocols.