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The Boulder is one of The Bazaar's OG one-shot builds, and its text is about as simple as it gets; deal Damage equal to your enemy's max Health.
It's all about the 100-0, looking to end the fight before things get out of hand. But of course, this is much easier said than done, and requires careful planning (and pivoting) to get it all together.
If your run is going poorly but you encounter The Boulder, you may just have a chance to turn it around completely. Let's dive in!
The Boulder has some pretty obvious drawbacks. For starters, it has an extremely long Cooldown without any built-in Charge mechanics (ex. 
Powder Keg), meaning you'll need a very dedicated setup to let it go off in a timely matter.
Secondly, you'll need to find additional ways to increase its Damage, or else you'll be extremely vulnerable to Shield builds. The Boulder only has one Ammo, and while it's not too hard to expand (or Reload) it, pulling off a second activation isn't always feasible.
As a Large Gold-tier item with very specific conditions, The Boulder builds are inevitably quite rare. However, it can be an incredible late game build if you're able to pivot and assemble the essentials.
The Boulder. If you're lucky with matchmaking you can potentially get away without additional Damage, but being too slow is not possible. You need at least 2/3 of these, otherwise don't bother.
Gunpowder is generally your best bet, which allows you a second activation against particularly tanky foes. However, this is only really relevant with a fast enough combo setup. Don't forget, if you're relying on Charge skills that have a limited number of uses, the second hit will be far slower than the first.
Captain's Wheel is one of the easiest and most reliable forms of Haste, as long as you have a Large item. Its main drawback is occupying two slot's worth of space while only providing a single effect. However, when it comes to The Boulder, speed is all that matters.
Its exceptionally low Cooldown makes it faster than most items in the game, helping you get off the ground running before the opposition comes into play. The only thing to keep in mind is its positioning requirement, in case you have other items that need to be adjacent.
Stacking Cooldown Reduction is probably the most reasonable approach, as it puts far less emphasis on skills, and can be assembled directly within Vanessa's own item pool. Charge and Haste are less important when your base Cooldown is already so low.
Star Chart, 
Seashadow, and 
Silencer are some of the common components. Star Chart in particular also provides Crit, which could be the difference maker depending on the rest of your setup.
The main challenge with these items is that they need to be upgraded in order to be viable; Silver-tier just won't cut it. However, don't forget that The Boulder still takes priority, as the shift from Gold to Diamond is a direct four second decrease!
Always try to think outside of the box, as there's plenty of support that lies well beyond the normal means. 
Phonograph is a powerful addition, and if you wanna go a step further, 
3D Printer + Silencer is a crazy combo. These are just a couple examples to lookout for in case you encounter Pearl's Dig Site or other specialty vendors.
A rare but extremely powerful approach to The Boulder builds is the addition of 
Juggler. This enables all of your Small items to Charge The Boulder, creating more of a Powder Keg-like setup that can make use of pretty much anything. It's all about having the lowest Cooldown items possible, so feel free to mix in any fast off-Hero items that you find.
Clamera is one of the best options from within Vanessa's pool, creating an immediate Charge while potentially triggering skills on-start. 
Jellyfish sits alongside as effectively a 3.5 second Cooldown item thanks to Clamera's instant activation.
Slow is a nice bonus to help disrupt the opponent before your combo goes off, which is party why 
Marbles fit in so well. 
Earrings matched the rest of the build accordingly, while 
PenFT is just fast in general. Many Toys tend to be very fast, so it's a good specialty vendor to visit when it shows up.
Mixed Message is essentially "Juggler at home", but that's more than enough to be included. While it does have limited uses, it's a lot more common to find and can still get the job done. Get it to Diamond whenever possible so that you can double the amount of triggers.
With this skill in mind, it's generally best to build with non-Weapon supporting items. While there are a number of fast Weapons that pair well with Juggler, they won't work with Mixed Message, plus they also disable Silencer.
Creeping Chill or any other Freeze skill is always a nice addition to help shut down the enemy before they can react. Creeping Chill tends to work best since it pairs perfectly with Clamera, but anything works as long as your trigger is fast enough.
Paralyzing Rush is another rare skill, but is a great pickup alongside Clamera. This creates an immediate on-start Haste effect for The Boulder before the Captain's Wheel activates, ensuring the fastest start possible.
For similar reasons as Mixed Message, be sure to only keep non-Weapons, as you don't want the Haste effect to be applied to the wrong target.
