Dragon Quest Builders 2 (PC) part 21 Ice Traps are surprisingly OP

Putting down an ice trap on the floor with a switch mid battle is surprisingly useful. Just gotta be fast about it.
...Poor Malroth's suffering has begun. I hate this part so much. Leave my buddy alone you...!
It's also not possible to revive the dead NPCs even by giving them HP. Maybe their data needs to be saved before they "die"... Welp, too late for me! Hahahaha haha ha... Damnit...