James McMurray
First Post
Well, insofar as the pool of elements is concerned, it may be dangerous, but that does not prevent taking 10.
Disarming a trap is dangerous, but it doesn't threaten or distract the PC.
Negotiating a treaty with demons is dangerous, but it doesn't threaten or distract the PC (unless some demons actually are).
For the most part, if you're not in combat, you can take 10.
True.
The tumbler's shoes allow you to take 10 despite being threatened or distracted.
You're not being threatened or distracted in the first place.
I don't know. I'd consider being buffeted on all sides by fire, rain, lightning, giant boulders, and intense psychic energy to be fairly distracting.

Where bathing in the pool does not allow taking 10: It's not a mundane task, which is the other thing preventing you from taking 10.
Tumbler's shoes do nothing to make a task more mundane.
I hadn't noticed that part of the take 10 rules, still being hung up on the 3e definition. I'll point that out.
Are you allowing them to use the same skill multiple times?
For this type of challenge, I would say that one they are only allowed to use one Athletics check as their whole swim through the pool. Or only allow one success with the same skill.
The challenge is such that they can use the same skill over and over, but get more benefits if they successfully expand their horizons and try multiple things. We've had challenges where you could only try certain skills a limited number of times, and challenges where there was only a single skill available and everyone had to use it no matter how good they were at it.