"Special: Using this ability untrained adds 5 to the DC unless environmental conditions dictate otherwise."
That's a little unconventional and not really necessary. If a first level character puts four ranks into this he has a +4 bonus over an untrained character anyways. If you think the DC should be higher for untrained characters you should just increase the DCs. There's no reason why someone with one rank would suddenly have a DC 5 points lower and a five point bonus. That's a cumulative of +6 for a single skill point.
Fixed.