SaGa Emerald Beyond PC Demo (Diva): VS Necronomicon/Cursed Monarch

A very difficult optional boss encountered during Diva's demo. At this phase in the game, the fight is honestly extremely RNG-heavy, you have to hope the death gazes from the minions go towards Diva since she's immune to the effect.
The boss is also immune to poison for some reason. I'm not liking how almost every boss I've seen in Emerald Beyond appears to be immune to that ailment, compared to Scarlet Grace where most bosses could be poisoned.