so, death's occupation is to cut down sinners in the apocolypse.The angels of death are always constantly working. Samael is the head of all the angels associated with death.He has caused many and uses corruption and destruction as well.The skulls in his hat are in fact, real and move around in the black parts and cry out.Sariel is in charge of healing and causing death with his bare hands.Azrael is in charge of recording lifespans and human life, and gives souls to God.They are all Grim Reapers