A giant rat is killed by people it’s trying to attack. S1E5 3 mins to 3:40 but right afterwards giant cockroaches eat it so skip to 4 mins if you don’t wanna see that!! Then at 13:20-14 they club another giant rat to death. Pretty gruesome.
There isn't just one scene of rape. It occurs a few times throughout the show. Also, the act itself isn't shown but the events leading up to it are, then a cutaway is displayed with INTENSELY GRAPHIC sounds playing...I'm not bothered by much, even rape scenes but those sounds really got to me.
Specifically goblin kids. For context: goblin slayer explains if they let them go- they will grow up and learn of what they saw and just continue the cycle. It’s also.. very brutal. Be wary.