Observing many dead villages that have managed to penetrate the 8th cave level a strange pattern emerges.
A lot of them have a characteristic 'cave-in' clusters of boulders close to the minehole ladder. Characteristic of trolls.
A few had even live trolls still wandering. Even I, myself managed to spawn one, after mining not that many tiles around.
Is there a pattern here or am I just imagining things?