don't know how it was fixed in DF, however that feels like a problem that was "solved" in DND; if you try and move via a medium for which you don't have a natur

don't know how it was fixed in DF, however that feels like a problem that was "solved" in DND; if you try and move via a medium for which you don't have a natural speed, you make a check - if you have a natural speed you don't need to make the check. Thus characters don't need to make "walking" checks, but they do have to make "climb" checks. Similarly fish have a swim speed, so they never have to make swim checks. In the event that your ability is impeded in some way (e.g. grease on a ladder) then you might have to make a check against your (normally not-tested) skill, which would be high for your natural movement modes.