artificer only

the premise of this build is a rocket launcher built around the magic missile as propulsion. the majority of the cost is the rocket itself. (90,000 gp cost)

materials for construction:

-5 pounds iron

-1 pound aluminum

-1800 spell scrolls of fireball(could take a while)that measure 6 inches by 6 inches 

-1000 ball bearings

-a net

-tinderbox

-several wooden hoops

-4 magic missiles contained safely so they don't go off

-1800 magic mouth spells cast on fireball scrolls(the trigger is detailed later)

-grease spell cast once

-2 springs(optional enhancement for higher capacity)

construction:

the rocket launcher shape is the same as the original one from halo. This easy-to-reload design is perfect for this build and you can store 4 rockets in it.

the rocket itself consists of 3 chambers,1,2, and 3. the chambers are 

plus a cone module at the front (part 4)

chamber 1

contains the 1800 spell scrolls of fireball enchanted with magic mouth

chamber 2

contains the 1000 ball bearings

chamber 3

covered in holes and the holes store darts

rocket cone

launches net when ropes are burned though

diagram of cone

sorry if this makes no sense

Sometimes planning is the greatest part of the game. =D

well the idea is magic mouth a bunch of spell schools of fire ball and make the tigger impact with a enemy and fire it somehow

This fundamentally does not work with the mechanics of the game.  Even ignoring how absurdly expensive 1,800 scrolls of fireball would be (using Sane Item Prices table, that’s 360,000 gold for the scrolls alone), scrolls require someone to read them and use their own magical energy (you have to perform a check to use the scrolls) for them to go off.  

A Necklace of Fireballs is the item you are looking for - each bead casts fireball upon impact if used individually (or you increase the level if using multiple beads on the same necklace). This would likewise be absurdly expensive - some 540,000 gold.

It also isn’t particularly necessary.  Gate at the bottom of the ocean, shooting a jet of water at the speed of a passenger airplane for over a minute, for example, would produce a directional wall of water obliterating anything in its path—and that would only cost a ninth level spell and a diamond worth 5,000 gold.  There’s plenty of insanely broken spells in D&D that you don’t really need to Rube Goldberg something that your fantasy DM is going to look at and say “yeah, your Halo thing just doesn’t work here.”

Also... okay, I'm a sucker for these kinds of weird gimmicks, but in this case I'm a little fuzzy on how this is supposed to work. The fireballs are propellant for the ball bearings, like magic buckshot, right? So, assuming you could get 1,800 scrolls of fireball, assuming Magic Mouth could activate them, assuming you had the time/slots to cast Magic Mouth 1,800 times, assuming scrolls and the Fireball spell worked such that the scrolls themselves would blow up (they don't)... what protects the user from the (huge) detonation? Five pounds of iron?

I bet you could pull off a similar effect with a Delayed Blast Fireball (one of them), though. Probably not to a cheesy, hyper-damage-dealing extent and that's a very high-level spell as it is, but you could build, like, basically a normal cannon (but skirt around stupid gond and his stupid no-gunpowder rules; he's not the boss of me). And, uh, fire it at most twice a day with no real advantage over just casting fireball at your target, whoops. But even if this idea worked as assumed, you'd probably only be able to do it once ever (tiamat never saw it coming), so twice a day is sort of an improvement?

well there is a magic missile in the tip for a instant hit(no idea if this would work)

-the ball bearings are also covered grease the they catch fire

-and once is fine.(I did the math and it does on average 77,754 dmg of four different kinds)

-the Iron is used to make a rocket-launcher-thing and I'm still trying to figure out how to make the range more than 30ft

-the actual payload is fired from the rocket launcher

Quote from Caerwyn_Glyndwr >>

This fundamentally does not work with the mechanics of the game.  Even ignoring how absurdly expensive 1,800 scrolls of fireball would be (using Sane Item Prices table, that’s 360,000 gold for the scrolls alone), scrolls require someone to read them and use their own magical energy (you have to perform a check to use the scrolls) for them to go off.  

A Necklace of Fireballs is the item you are looking for - each bead casts fireball upon impact if used individually (or you increase the level if using multiple beads on the same necklace). This would likewise be absurdly expensive - some 540,000 gold.

It also isn’t particularly necessary.  Gate at the bottom of the ocean, shooting a jet of water at the speed of a passenger airplane for over a minute, for example, would produce a directional wall of water obliterating anything in its path—and that would only cost a ninth level spell and a diamond worth 5,000 gold.  There’s plenty of insanely broken spells in D&D that you don’t really need to Rube Goldberg something that your fantasy DM is going to look at and say “yeah, your Halo thing just doesn’t work here.”

 my dm is very forgiving so I thing ill think be able to pull this off anyway.

We used to use a rule. If you broke a wand it would release all of its charges at one time.

A wand of fireball with 10 charges would explode with the effect of 10 fireball spells at once.

Now that would make a nice trap.

Or find a way to use a trebuchet to throw a rigged mechanism with a charged wand inside.

I'm using that