The Executed Sage is Reincarnated as a Lich and Starts an All-Out War

Alternate Name: 
Казненный мудрец переродился в некроманта и начал тотальную войну
الساحر العائد للإنتقام من العالم~الساحر الذي تم إعدامه أعيد إحيائه كليتش وبدأ حرب ضد الجميع
ปราชญ์ผู้ถูกลงโทษ ได้เกิดใหม่ในฐานะลิช และเริ่มสงครามสุดกำลัง
処刑された賢者はリッチに転生して侵略戦争を始める
Status: 
Ongoing
Author: 
YUUKI Karaku
Artist: 
KUNITOMO Shoutarou 
Type: 
Manga

The Executed Sage is Reincarnated as a Lich and Starts an All-Out War summary:
The Sage Dwight, he along with the Hero defeated the Demon Lord who sank the world into darkness.
However, they were falsely accused of becoming the next Demon Lords because of his power, and were thrown to The Valley of the Dead to die.......
But though his flesh has rotten away, he lives on as a skeleton because of his grudge against the world. Dwight has vowed to deny that wrong world, and with a power that surpasses even the Demon King of the past, and also leading countless Skeletons he's going to start an all out war...!