Paul's Kingmaker Campaign
The kobold shaman of the Sootscale tribe, Tartuk managed to wrest power from Chief Sootscale through trickery. Playing upon the superstitious nature of the kobolds, he convinced the tribe they had been cursed and that he should lead, not Chief Sootscale. He was killed by Chief Sootscale when the adventurers arrived at the kobold’s cave complex.
In truth, Tartuk was a reincarnated kobold, having been a gnome in his previous life. He was killed when his village was attacked by ogres. He had intended to come forward and assist the ogres in destroying his village if they would let him live when he was accidentally killed in the battle. Seeing his death as a noble sacrifice, the villagers chose to use a scroll of reincarnate to return him to life. He was mortified by being turned into the one creature gnomes hate above all. He found a tribe of kobolds, took it over from within, and managed to trick the entire tribe into activities that brought them to extinction. He did this at least two more times before coming into contact with the Sootscale tribe.