The word is a synonym for Megalomania and its meaning, more so the anti-Megalomania, see Vendetta, with lawful intent of avenging friends and/or family, with more intensive power to return.

Gathering from this, we can assume that a Megalovaniac is someone with focused power avenging someone, rather than killing, and gaining power.
He may have been greatly powerful, but he didn't count on him having such a powerful Megalovania, overpowering him entirely.
by MonkeyGuyJack September 15, 2019
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