Battle Against Shogun Stupid is the 5th and final stage of Shogun Stupid, the 2nd episode of Disgaea 7: Vows of the Virtueless.
Story[]
Battle[]
This stage unlocks Jumbification and serves as its tutorial. On your first visit the Rage Meter starts at 50%, so sacrificing 2 allies will fill it enough to use Jumbification yourself on the second turn.
Yeyasu starts the battle already giant, but the main issue is his Unique Evility which increases all of his stats, making him strong enough to likely kill even your own giant unit in one hit. However this Evility has an activation condition, so if you disable it you should have no problem surviving his attack and finishing the fight later.
Only the boss needs to be defeated to clear the stage, so you don't need to worry about the other enemies beyond slightly decreasing the effect of Yeyasu's Jumbility or building up a Combo to power up your giant unit's attack.