You thought everything was gonna be daijoubu after the Great War but, no, the Satans" descendants and followers thought it would be a good idea to continue the war. Others, such as myself, however, disagreed with that and thus began the Civil War. Right now I"m standing in a battlefield, in front of me was an army of thousands belonging to the Old Satan Faction while behind me was another army of comparable size belonging to the Anti-Satan Faction. After a battle cry by the leader of the Satan army, I quickly charged toward the enemy army faster than anyone could react and started using my taijutsu to disarm my opponents and send them flying(imagine Madara vs the fourth division). "MEN BACK OUT," I yelled after getting bored. After they got out, I flew up to the air and charged a giant ball of destruction energy before throwing it toward the Satan Devils. After the ball landed, it made a huge explosion that wiped out all the Satan Devils. Anyways the war continued for a while before we forced them into fleeing to the end of the Underworld. Sirzechs also had his wedding with Grayfia and became a Satan shortly after the war ended.