Alex_R
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You can't curse the Champion of Darkness... but you can bless the Titan, and so on... it turns out to be just as good as the Champion of Darkness =)))
And the Devil is weak because of its defense and HP...
Actually, magic immunity is a plus... and judging by the Champion of Darkness's reputation in all the games, it's valued precisely for that. (the coolest ability of the coolest monster)
As for the Devil... I don't remember how much defense it has, but compared to the Titan, it probably doesn't lose out, especially in terms of HP.