Sabbat the Necromagus

Soppi Walters or better known as Sabbat the Necromagus is a villain that appears in Judge Dredd's comics. He is an incredibly powerful and immortal necromancer who has destroyer his own home planet, and he travels into the past to erase Johnny Alpha's timeline, and he is also the ruler of a zombie army. He is the main antagonist of Judgement Day.

History
Soppi Walters was a blond boy who was bullied by another boy named Dennis Mennis. As he goes home crying he meets a friendly witch who gives him access to magic but prevents him from learning about black magic, he then kills her and studies about black magic, including the necromancy he uses to be immortal, he kills Dennis and ressurects his corpse so that he can torment him for life, he then 2 million people in Bethsheba and uses the bodies as his galactic conquest. Sabbat was later confronted by Johnny Alpha who is a bounty hunter. Sabbat then decided to erase the timeline od Johnny Alpha traveline the past and destroy the Earth. He arrived at a conference where he warned the judges not to interfere with their plans. He was then shot in the head by Judge Dredd, but survived. Then Sabbat led a zombie army in five mega cities around the world. And to stop the outbreak at once, Dredd then orders nuclear weapons to be used, with billions of people being killed in the process.

When Sabbat's location is identified, Dredd then leads an attack to defeat it. However when Sabbat uses his powers to disable flying vehicles, they are then forced to parachute to Sabbat's lair. Most of the judges are killed, while the rest are captured and tortured by Sabbat. After that Sadu manages to free Dredd and Alpha at the cost of his life. With this Dredd and Alpha fight against Sabbat, which is only revealed that Sabbat is immortal. Yet despite all this Sabbat is defeated when Dredd beheads him and places Sabbat's head on a rock, leaving him powerless. With this Dredd and Alpha make Sabbat still and unable to move for all eternity. And after Sabbat's defeat, his army collapsed.