I got longnose gar and pike in my river. They were peaceful for a long time and I became complacent. And then, they struck! First a caravan guard was pulled in...a hammerer. He fought valiantly but was nibbled to death and suffered a painful watery death. Then the others struck, next was a fisherman, and before the fisherman stopped struggling one of the miners taking a drink from the river was brutally attacked by gar. He was pulled in screaming and the river ran red.
The military was mobilized in response. An axeman and crossbowman. the crossbowman died first, on his way to his station a fish leaped out of the water dragging him in, he didn't fire a single bolt. The axeman rushed to his aid and slain the evil fish, however his partner drown in the river, unable to escape due to his wounds. With the continuing offensive the axeman slew 3 more fish, being pulled in on 2 separate occasions but escaping thanks to the emergency ramp that was built while the fish were distracted. Then he was overwhelmed by multiple fish and also died a horrible nibbly death.
Then the wholesale death began, people were thirsty. There was booze, but only one barrel. If they couldn't get booze they went to the river, where they were grabbed and devoured by the devious aquatics.
It was horrible... I vote for a old nemesis megabeast as well. Careagluniphantder. Eight legged, flying, fish tailed, one eyed, elephant, horse. Though that sounds more easter egg potential than anything. I'm sure the modding community could create such a creature in five minutes.
EDIT: Late night post, pardon the bad grammar. At least I just fixed the spelling.
[ May 28, 2008: Message edited by: Greiger ]