Satan, A.K.A. Lucifer is the final boss of Painkiller. He is the Ruler of Hell and former angel. He used to be one of God's angels, but when He created the first humans, Lucifer has grown jealous and eventually was banished from Heaven. He seeks revenge on mankind and wants to eventually conquer Heaven by conducting the Final War between angels and demons. Even though, he believed his armies to be too weak and outnumbered to start the War, which caused many of his generals, including Alastor, to turn against him. After Alastor was killed by Daniel, Asmodeus appeared and revealed himself as Lucifer himself and then he took Eve to Hell with him (he seemed to have feelings for her). He appears as a giant bipedal winged demon with a sword. The only way you can kill him is through Demon Morph. You must use the rocks he sends into the battleground to bounce them onto him and cause him some damage. When Lucifer is charging an attack with his sword, Demon-Morph the sword, to kill him. He is the most powerful demon in the game. In the level Hell, you must collect souls from the invisible demons and once you have enough, 66 souls, he will appear. He lasts for a few minutes and then you must get back to collecting another 66 souls, until you defeat Lucifer.