After a long absence, I just started a new game usign the latest version.
Flatish Forest/scrub biome, wilderness, with a stream running through.
Started digging down, but hit an aqueduct. Decided to wall in an above-ground area with logs, before attempting to breach the aquaduct. Built the wall up to the stream, and then assigned a bridge across it. Mechanic/architect picked up a log, trotted up to the bridge...
And suddenly, there was blood and teeth everywhere, all over the grass and spreading through the water. And no sign of my architect. Looked down a level, and there he was, injured and drowning. Checked the combat logs:
the Mechanic Deler Arustducim is fighting!
the Sea Lamprey is fighting!
The mechanic attacks the sea lamprey but He jumps away!
The sea lamprey slaps the mechanic in the head with his tail, but the attack is deflected by the mechanic's (pig tail hood)!
The force pulls the neck, tearing apart the skin!
The sea lamprey slaps the mechanic in the left upper arm with his tail, bruising the muscle through the (giant kakapo leather cloak)!
The force pulls the left shoulder!
Deler Arustducim, Mechain: Those injuries... Begone fear!
The sea lamprey slaps the mechanic in the right upper leg with his tail, but the attack is deflected by the mechanic's (giant kakapo leather cloak)!
The force bends the right hip!
The sea lamprey slaps the mechanic in the left lower arm with his tail, bruising the muscle through the (giant kakapo leather cloak)!
The force twists the left elbow!
The sea lamprey slaps the mechanic in the upper left back teeth with his tail, and the severed part flies off in an arc!
...etc, until my poor mechanic/architect was dead from either drowning or being beaten to death by a lamprey.
I think fish are hardcore again.