Malignus is the final boss in the main story of The Denpa Men 3: The Rise of Digitoll
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Malignus will appear right after you defeat Aflama, since he uses the idols that the protagonist has gathered since the protagonist thought he/she needed them to rescue Crystal. Malignus can deal fatal damage if you don't have a healer or reviver with enough AP to use their skill. Malignus is weak to light element attacks, so its good to prepare a Denpa Men who has that skill. Once Malignus is defeated, the fairies will come and seal him away, and the day is saved. However, after the ending credits, Malignus will transform into Best Malignus and say how much he hates the protagonist. The protagonist will later run out of his/her house and say they had a nightmare.
Picture of Malignus