The sudden Mood Whiplash in episode 2, as well as Fear's true nature, are very disturbing.
Amanda reveals that Taciturn Chatterbox was her mentor. However, when Taciturn wasn't teaching Amanda, she treated her like her toy.
The Wittelsbach Knights in general are this. Cursed sets of knight's armor of a perished kingdom. Their history states that while guarding the throne room the knights had to listen to their loved ones being tortured and violated by the enemy, and in order to protect the king could only endure. However, their efforts were a waste because the king was already killed in the backroom beforehand, and the enemy did that just to demoralize them. Gone mad, the knights exited the room and fought until they no longer could, becoming martyrs. When Fear knocks a helmet off of one of them, it's confirmed those knights' corpses are still inside the sets of armor.
In volume 12, after Kotetsu, another cursed katana, takes Kururi hostage. In an attempt to make her key absorb enough emotion to unlock the box that contains the indulgence disk, Kotetsu torture's her, making her key fill with negative emotions. That's not all, the feminine cursed tool's curse is a variation of Konoha's "to see blood", to drink blood. After punching holes in Kururi's body, Kotetsu precedes to drink the blood that comes out of the opening, licking all over her skin. The process repeats by making new wounds, and then drinking the blood, and this continues until Fear and others get to them. It looks very much that Kotetsu is raping Kururi. Then, at the end of the volume, you find out that the very female looking cursed katana is aTrap.
In volume 14, a group of thugs suddenly appear at the rundown mansion where Nurashaaki is hiding out. They appeared to have been sent there by the bribery of someone. They start fighting Konoha and Kotetsu, but being fodder, they easily get trounced. The LN describes the one way slaughter very graphically, of them losing limbs, and their blood spilling everywhere. Due to his curse, Kotetsu is sucking the blood off the cut off limbs. It's very disturbing, and major Mood Whiplash since Peavey's introduction.
