according to my bing search a 10 ft wide boulder would be are 21,875 pds but they depends on what stone it is.
And that's when they release the acid down the gutters in the sides of the corridor.Unless it's going incredibly fast, like, way more than 10ft/second, then they shouldn't need to save if the players actually say "we dodge to the side". If a player ums and ers about it, sure, an easy-ish save might be warranted, but the thing is 15' tall, so you barely even need to duck to avoid it, given it's a sphere, in a roughly square corridor, if you just move to the side, which, assuming the corridor is barely 15' wide and you're in the middle, takes under a second (just try walking 7.5'). If it's a total surprise and coming at level 30+ mph or something then a save might make sense, but 10'/second is 6.8mph.
This is kind of less of a trap and more of a feature.
The widest point would be at 7', which is over the heads of most PCs.
The thing about the 7.5 foot gap is that it's also infinitely thin. So would be crushed under the boulder, just between the boulder and the wall, which is not that much better. If you want even six inches of width, that reduces the height to under five feet of height, and if you want a whole foot of width you'll need a height of less than four feet. (I'd maybe be okay with a small creature managing it, especially since the only small creature in the party is the NPC kobold "guide."but the thing is 15' tall, so you barely even need to duck to avoid it
So my math is that volume of a sphere is 4/3 pi r^3 = 4/3/ pi 7.5^2 = 1767.15. I googled what a cubic foot of granite weighted and got 168 about pounds. 168 x 1767.15 =298,856.according to my bing search a 10 ft wide boulder would be are 21,875 pds but they depends on what stone it is.
It doesn't have to be, but I think it makes the most sense to be. (Though maybe there's something else fun inside.)Does the boulder have to be solid?
The hollow rock is full of a magnetic liquid. Wile E. Coyote and an ACME Giant Magnet can drag the rock back up the slope. (Be careful about getting out after setting the hidden panel - especially if he is still carrying the magnet.)The concrete ball is hollow like a chocolate bunny.
That’s the only way this trap can get reset anyway.
Oh, oh, wait! Here's what you do...
Get yourself a big honkin' wedge of really stout oak, possibly bound in iron bands if you can manage it. Set it in the center of the corridor. Place the immovable rod against the downhill side of the wedge, and activate it. Yes, there will be more than enough force to deactivate the rod, but not before that rolling ball - that is traditionally only just big enough to fit in the corridor - will have tried to at least a bit roll up the incline, gotten several inches of wood under it, and wedged itself solidly in the corridor, unable to roll down.
Added to that, such a heavy rock would likely crumble under it's own weight, and quickly stop being a sphere, bringing it to a grinding halt. The difficulty isn't stopping such an object, it is keeping it moving.If you somehow run over the SMALLEST THING (like, not exaggerating, a penny or computer screw) while moving that pallet jack the entire thing is IMMOBILIZED. No amount of brute force will get that 1500 pounds of servers up and over that penny. Its so ridiculous, but its true.
You'd just need to add a raised curb to the sides of the corridor to act as a channel and keep it aligned.A cylinder wouldn't be as likely to crumble as a sphere, but if it went even a tiny bit out of alignment it would wedge firmly against the sides of the passage.
Look, dude, if you are going to go through the trouble of managing a single 300,000 pound rock for the purpose of squishing people, you can manage this.A cylinder wouldn't be as likely to crumble as a sphere, but if it went even a tiny bit out of alignment it would wedge firmly against the sides of the passage.
Maybe I've been designing my dungeons all wrong. What was I thinking adding all those secret passages, treasures and easily escapable traps?! From now on all my dungeons will be hopeless rewardless death traps.What is the point of going through the work of that rock, and leaving huge gaping holes a halfling could just walk through?!?!
You miss the point - scaling the boulder up to that grandiose size is what makes it escapable, and thus foolish. Adding the size makes it a worse trap, not a better one.Maybe I've been designing my dungeons all wrong. What was I thinking adding all those secret passages, treasures and easily escapable traps?! From now on all my dungeons will be hopeless rewardless death traps.
The firm of Acererak & Grimtooth, Architects, invites you on a tour of their demo-dungeon.Maybe I've been designing my dungeons all wrong. What was I thinking adding all those secret passages, treasures and easily escapable traps?! From now on all my dungeons will be hopeless rewardless death traps.