Soul Sacrifice - VS dual Illecebra on Avalon IX Penitence - Serpentine Forest Lurkers.
Basically the tactics is put bombs, vacuum them, slows the archfiends down using Seadevil's Scales, then deal as much damage as you can to both Illecebras at once and finish with Infernus....
I got lucky that both Illecebras are weak against the elemental i used so the both got frozen instantly after the bomb explodes and i didn't even need to cast Infernus. Otherwise, you might need to cast Scales before Golem and throw few Eggs to make them frozen.
Worst case scenario if both Illecebras have same starting elemental as your spell, you're screwed up, and better to exit mission and retry as it will be a long and bloody quest that not worth the time.
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Illecebra has two stances, one standing up, and one when she is bent over backwards. The effect...