The Emperor is a powerful foe skilled at using magic. He is especially adept at using several types of fire magic attacks, so it would be wise to raise your fire resistance and SPR before challenging him, kupo!
He also inflicts stop, so make sure to prepare countermeasures, kupo!
A large amount of the Emperor's HP is restored every turn, so attack with all your might to inflict damage greater than the HP restored, kupo!