malraux
First Post
So a level 1 PC doesn't need a 15 to climb a ladder and 10th level PC need a 25 to climb the same ladder. The PC isn't setting the DC. However, a ladder in a "level 1" zone is DC 15, while a ladder in a level 10 zone is 25, probably because its higher to climb, made of human bones, etc. If the level 1 ladder ended up shipped to the level 10 zone, it wouldn't become DC 25, mostly likely it would be ignored; its no longer a meaningful challenge to climb the 15 ladder unless there is a drastic chance of failure (since everyone can take 10 and they have at least a +5 from level).
More likely, in the level 1 zone, ladders are mostly available, while in the level 10 zone, the distances are too great to scale with a ladder and so the character needs to scale the rough wall. Even higher levels and the entire tower is made of glass and very hard to climb.
				
  Oh, man, that was funny.