Killer DM
I did it. For only the second time while running this gaming group, I have killed a PC. Not me, personally, of course, but the characters in the published adventure Keep on the Borderlands. The priest and his acolytes who lived in 7b did their job. They were killed afterward, but it was amazing.
The party entered the kobold caves (A) at the Caves of Chaos. Three out of the four PCs fell in the pit trap at the first intersection, with the evil priest. That left a second level mage above ground with the two traitorous acolytes. The PC mage cast a Wall of Fog to protect himself from the attacking kobolds. That was all the opportunity and cover the acolytes needed. As soon as the mage couldn't see them, they attacked. The rest is PC history.
The party entered the kobold caves (A) at the Caves of Chaos. Three out of the four PCs fell in the pit trap at the first intersection, with the evil priest. That left a second level mage above ground with the two traitorous acolytes. The PC mage cast a Wall of Fog to protect himself from the attacking kobolds. That was all the opportunity and cover the acolytes needed. As soon as the mage couldn't see them, they attacked. The rest is PC history.