In Buddhism the word translated as 'demon' is the Sanskrit , which means 'bringer of death'. There are Four Kinds of Demons: 1) demons which are afflictions, 2) demons which are illnesses, 3) the demon of death, and 4) heavenly demons. The first three can be said to be internal demons and the fourth, external demons. The head of the heavenly demons is Mara the Evil One, who rules over the Sixth Desire Heaven. The demons of that heaven derive their bliss from preying on the energies of other beings. They are particularly threatened by those who practice on the spiritual pathways that reach beyond their realms and finally lead to genuine enlightenment.