Lochwood

I was playing a game recently (Large map, 9 civs) in which the Korath were doing particularly well. After a certain point, several other races surrendered to them in sequence, leaving the Korath with near total dominance. All well and good, but very puzzling. Leader after leader would send a diplomatic message, roughly: "We're losing, so we've decided to surrender to the Korath, we hope they'll be merciful." But... they have the stated public aim of wiping out all