Chapter 6 - Invasion. The Forceless invasion of Sleheyron. Lots of innocent people either die or arepossessed. Zolph is naturally horrified that he's being forced to kill innocents if they are possessed (he was even forced to kill a child). And the worst part, both he and Grein know they won't even be able to save half the planet's population.
It's not much better with the less innocent people either. One of Girdretto's lieutenants is pretty horrified about what's happening to some of his associates and is fearful of being possesssed, and he can be heard being possessed over comlink.
Chapter 11 - Possession: Hydrojus. To describe its abilities, think of bloodbending when at its full deadlypotential. Even the Galactic Alliance troops that accompany Zolph to either seal or kill it are horrified when they see what it can do. It also manages to temporarily hijack Grein's body.
"Chapter 4 - The Damaged" continues the Psychological Horror from Chapter 2. How much worse does it get you say? Dagobah had a strong Dark Side presence in one cave, but Korriban has it all over the planet. And it takes a Sith ghost mind raping Zolph to make him run into that apparition of Dynn again. And what's worse is that no matter what Zolph tries to do, she won'tgo away. Shoot her in the head? She'll reappear behind him and regenerate it. And she gets angrier the more Zolph tries to flee from her. And later, she reappears as a Faceless Eye on the ceiling with multiple arms.
What's worse is the reason she's so persistent about killing him: Zolph subconsciously wants her to because he thinks his life lost all meaning when he failed to keep her from dying. As Zolph himself points out, if not for Grein's constant intervention, he'd either be dead or in an insane asylum.
Chapter 5 - Resolve. As soon as you'd think the Dynn hallucination wore out her welcome, she's stopped trying to pressure Zolph's previous Death Seeker tendencies and tries to bring up the idea of everyone (including his friends) being possessed by the Forceless Collective, while he - being immune to possession - will be alone and possibly killed by them. Thankfully, Zolph doesn't give in.
Chapter 8 - The Enforcer.EmperorValkor. Almost everything about him is terrifying. He's also cannibalistic. And what's even scarier? As Mursama learned, the people eaten by him don't die. They suffer farworse. You got to wonder how the rest of the Valkoran stay sane being on the same planet as him.