There's also the Clockwork Horrors, which rack up 15 fatigue/turn regardless of what they do, IIRC. I don't off-hand recall another unit type which automatically gains fatigue even when idle, other than any permazerkers w/ the automatic +2.
__________________
Are we insane yet? Are we insane yet? Aiiieeeeee...
I've lost a teleporting statue once, just because damn kappas routed but couldnt flee So my statue auto-routed and died instead. It was supposed to be my secred weapon of victory, *sob.