I agree with the general sentiment that there are limits to what should be possible even with the rule of cool.
In this specific case we don’t even need to go into the territory of undefined stuff that the DM decides on the fly, the rules as written already explicitly say “You create up to 10 gallons of clean water within range in an open container.”
Best way to decide is this : should a cantrip or level 1 spell one shot a target ?
No. No it shouldnt. Disintegrate can because its a very high level spell slot. But resources wise, foot the fucking bill please.
But I would allow its use to torture a captured target by waterboarding.
Well it depends on the circumstance. The “captured target” you mention is helpless. You absolutely can oneshot him with any number of cantrips, or other mundane actions. You could oneshot him with a “use an object” action if that object is a lever controlling a trapdoor over a deep pit.
Point is, you certainly can drown someone with 30 gallons of water. You just have to set up for it correctly. I don’t really like the implication of your comment and the original post that it’s unreasonable to try such a thing just because the number used to categorize the spell is too low.
If the target is already captured or subdued, nothing can oneshot them. That’s just coup de grace.
“one shot” says to me that it instantly kill or removes as a threat an as-of-yet untouched and un-interacted-with target.
I don’t know why anyone would put that much effort into doing something so convoluted if not just to prove the point that they could. Which feels like it’s against the spirit of the game.
It’s not even the “use object” action that kills them as much as fall damage, which is not defined by the level of the one pulling the lever. This is more comparable binding someone to an anchor and pushing them into a body of water. It’s not a personal ability, it’s an environmental effect.
I don’t really like the implication of your comment and the original post that it’s unreasonable to try such a thing just because the number used to categorize the spell is too low.
This seems the best reason to refuse it, frankly. Spells have a reference of how damaging they ought to be, that’s what HP is supposed to measure. It’d be just as easy to say “but if fire/acid/steel hits the target just in the right way that’d kill them on the spot”. The main reference we have to whether it hit them good and how much they can endure is the HP. Why shouldn’t we be using the numbers the game gave us expressly for the purpose of measuring power?
If we are just gonna bypass these basic mechanics with improv, why not to let the Fighter player say that they are trying to cut off the enemy’s head with every hit? But if we let that fly we aren’t playing D&D anymore, just some loosely d20 based improv.
A 1st level spell focused on damage does at most 3d8, but Create Water is definitely not focused on that. The most generous version of that I could accept is 3d4 damage with a dex save for no damage, because if they close their mouth and stop breathing it just doesn’t work. You might end up running out of spells slots before the target dies.
