Graphic: Death, Gore, Blood, and War
Moderate: Body horror, Infidelity, Violence, Kidnapping, Death of parent, Murder, Fire/Fire injury, and Injury/Injury detail
Minor: Animal death, Bullying, Child death, Misogyny, Slavery, and Xenophobia
The crystal spiders ay eggs in people once their dreams have gone stale, and this is once described their victims being "impregnated", which doesn't feel quite right. How the eggs emerge from the hosts is body horror.
Nobles secretly fathering illegitimate children is described in an indirect, euphemistic way (e.g., "seeing each other", if I recall correctly), and both noble fathers end up being as supportive to their illegitimate offspring as they can manage under the circumstances. Still, it's an important part of the plot and occupies a pretty significant chunk of its pagetime, which is why it's marked as "moderate".
Lily's dog Custard, who is a ghost, died in the previous book; beyond the obvious from the premise of a ghost dog, it is brought up again twice, including in a tragic reminder of her burying her dog, not knowing it would return as a ghost. Knowing the tone of this book and the gruesome things that happen, someone might have thrown up, and it may have been described briefly, but I won't mark it because I don't know for certain. The body horror is typical of "rotting corpse"-style zombies.
Dott is bullied for being a troll, and there's distrust/xenophobia of trolls, although I'm not sure if that should count since trolls are a clearly nonhuman fantasy-species.
It is already established that Dante, Lily's brother, is dead, although he was technically a teenager.
Two villagers are parents who are murdered by crystal spiders. While they have names, and their farm is investigated at the crystal spider outbreak, and one of their sons tearfully asks if Lily the necromancer can make them alive again, they aren't really major characters, so their deaths felt fairly easy to stomach.