* AwesomeMusic: The OP, Lisa Komine's "Sora ni Saku", better known by its English version "Faith."
* NightmareFuel
** The first episode where an old man who is supposed to be dead is resurrected... wait, that's not an undead, it's like an... EldritchAbomination!
** [[spoiler: Oswald Lenn Mathers]] in the fifth and sixth episode, who is a formless monster that can use any demonic form he desires...
** Fin Cruda in the last three episode, along with TheDragon, is what could be described as "If Giygas has human form"...
** The [[BigCreepyCrawlies giant, floating larva]] in Sekiren's debut episode. Coincidentally, it actually does have the power to cause nightmares in the show itself.