A couple sessions ago I did my best to kill at least one party member with a white dragon. Everyone was super scared and it got pretty dicey for a bit. I managed to drop a few people down to 0, though there was a healer running around picking them up so that everyone survived.
Tonight they face a green dragon and up to about 20 dudes, including some ettins and a boss elf guy, and I can make the lair entangle them. I often joke that I want to outright kill a party member because I've never done it before, but tonight I am actually super concerned that I'm about to wipe them out completely.