This is the 11668th most frequent French word.
satanique
Relating to or characteristic of Satan; diabolic or evil.
Here, 'satanique' is an adjective describing 'thèmes' (themes), indicating themes related to Satan or diabolical aesthetics.
Cette peinture a des thèmes sataniques.
This painting has satanic themes.
In this sentence, 'satanique' metaphorically describes 'comportement' (behavior) to convey an extreme or ominous quality.
Son comportement semblait presque satanique dans son intensité.
His behavior seemed almost satanic in its intensity.
The adjective 'satanique' is used to specifically classify the nature of the 'rituels' (rituals) depicted in the film.