Daemons are good or benevolent «supernatural beings between mortals and gods, such as inferior divinities and ghosts of dead heroes» and differ from the Judeo - Christian usage of demon, a malignant spirit that can seduce, afflict, or possess humans. (religion.blogs.cnn.com)
The main levels use all three heroes and are easy because save points are frequent, health regenerates and dead heroes float to the nearest ledge for reviving. (newgamenetwork.com)
Toukiden instead replaces all that with mitama which are the souls of dead heroes that offer four skills you can activate while on a mission. (monstervine.com)