The malichor itself. Rots your skin, turns your eyes white and all sufferers are in constant pain. The reason you venture out in the first place is to find a cure, because there is no known remedy for it.
All the creatures you meet on the island tend to be monstrous hybrids that take the worst parts of their constituents. The Vaileg are bears that hunt in packs. The Dosentats are giant bats with human bodies. The Dantrif are land-sharks. These are terrible things to find in the forests.
The Nadaig. Take your pick. Whether it's the cephalopodic Glendemen, the uncomfortably jiggly Vedemen, the deer-skulled Frasamen, all of them are equally horrid.
The Ghost Camp. Just being tortured as a part of the daily regiment, and speaking out against it will force all your peers to beat you to death. If you refuse, then you're the next in line for the beating.
Cera's torture at the hands of the Bridge Alliance. The way the commander is visibly shaking with rage at the fact that her victim refuses to speak. She gives her a speech about how escape is futile and stomps on her neck for good measure. What really highlights the monstrousness of this behaviour is that they cordially speak to you when you come across their camp, as though they hadn't just been mercilessly beating another human just moments prior.
