I don't need to make nat twenties. I need to roll a 9( 12 once rage is finished) or better if the water is stormy, and the rest I can take ten on. I would go quite a bit farther than 210 feet in two minutes, even if Willfor decides that I can still only go 15 feet per round when swimming up and using my natural buoyancy. I would go about 300 feet, leaving me at 160 feet, 11 rounds to go, having to make constitution checks, which endurance applies to. I'm likely to fail if the GM goes with the fifteen foot speed still, as +9 is unlikely to make eleven checks, some of which are DC 20 and 21. Temperature(don't think there's actual temperature damage in this scenario) and pressure checks I get a fortitude save against, temperature at least I get my endurance bonus to(who knew the feat was actually fuckin' useful?), and honestly they're low enough only severe unluck would defeat me due to it.
What's really gonna fuck me though? The fall, I found, does a total of about 65 to 70 damage, from using invisible castle to test. Then, I have to fight the boss, after being fatigued and probably using up my rage. The boss is probably a third to fifth level barbarian. My consolation is that he might have taken similar damage to me, and isn't as tough, maybe not as strong, and probably also out of rage. I also have no piercing weapon save, like, an improvised one from my arrows assuming they haven't been lost. I can, however, take a deep breath, and grapple him, and say "Fuck you" to the people who say dwarves aren't good in water when he drowns first.
Another note, is that I'll not be hitting the water at 120. Dorf is trained to swim. He has ranks. He knows that when diving, if you hit wrong, bad things happen. He also knows that bad things are going to happen, period from this height. Having had around forty minutes of falling to experiment, he's probably figured out two thing, since he's not stupid. One, that he can use his axe and his beard to steer himself. And two, that he can spread his body to slow down, or tuck in to speed up. When he sees the water, he's going to spread out, and hit hard, like a bellyflop, but slower. Impact damage and possible exhaustion? Still apply. But, he will slow down and stop a lot faster. Probably a change from 140 to 80, maybe 70. That's about 260 feet for 80 meters.
All things considered, though, Wrex is right. Death is my likely forecast for this evening. And on the possible front, glory!
Seriously. CR 4 person. All to myself. The experience points are MINE. Or his, if I die, and he probably steals my axe. The fucker.