When I Left, the Demons Came

For 300 years, he guarded the human border, holding back the demon hordes. Yet, his peaceful people branded him a war-mongerer, falsely claiming the threat was gone. Exiled by his king, he watched his homeland crumble within days as demons attacked. Meanwhile, he found a new realm that recognized his power. As kingdoms fell, he single-handedly crushed the invaders, forging a new empire. The fools who abandoned him got what they deserved.