Well, in the 'Jurassic Park' novel, a lot of people die. The dinosaurs are the main cause, obviously. Some characters die in really gruesome ways, like being chased down by a T - Rex. Others are picked off one by one by the smaller but no less deadly velociraptors. There are also deaths that are a result of the park's infrastructure failing, which leads to people being in the wrong place at the wrong time and getting killed by the dinosaurs.
I'm not sure specifically which 'Mayuri novel' you are referring to. There could be various reasons for deaths in a novel, such as battles, diseases, or sacrifices. Without more context about this particular novel, it's difficult to list all the deaths.
In the 'IT' novel by Stephen King, there are numerous deaths. Many children in Derry fall victim to Pennywise, the shape - shifting evil entity. For example, Georgie, who is brutally killed at the beginning by Pennywise in the form of a clown. These deaths are often very gruesome and are part of what makes the story so terrifying.
I'm not sure exactly when season 2 of JJK ends in the manga. You might want to check reliable manga forums or official sources for the most accurate information.