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If we compare them based on the principle of "who would win in a one-on-one fight," then without a doubt, the Undead or the Dungeon Lord would win.
However, if the Ghost has "Miss," "Miss," "Miss," "Miss," "Miss," then...
And if we compare creatures of level 7, then the Fallen Angel (unless it's against a Lava Dragon).
If the Lava Dragon is an elemental, then why does morale affect it?