Hurgleman |
Many things in Pathfinder are ultimately meant to be an abstraction, not really meant to be physics-accurate. For example, why does a fireball have a defined edge of effect instead of spreading? XD
On the other hand, if your whole table enjoys that... it's not a problem to work it in, either. ^^ The rules and ideas are yours to change. If you want something relatively normal, I suggest checking out water pressure, depth, and its potential for harm.
I generally don't need to do any kind of calculations for a campaign (aside from things like making sure ropes are long enough). The biggest one is largely an abstraction for a home game series - how much faith does someone need to become a deity? XD
Oooooh, that's a good one. Water pressure! I'll be doing some research on that one! Currently I'm formulating ideas.