20 Minutes Till Dawn – Thor’s Mini-Gun Build (Never Reload, Max Fire Rate)

Describes how to make a lighting based build that will get you to 20 minutes, and shows potential growth after you got the core of the build.

Thor’s Mini-Gun Build Guide

Character and Gun


For your character choose [Spark].

We start with spark because she has a 50% on hit to summon lightning, this will be required for the inf ammo build.


For your gun choose [Dual SMGs].

This is for 4 reasons:

  • The large magazine counters the fact that there is some chance involved with the inf ammo.
  • Triggers the “on shot effect” twice per shot, this will call lighting more often.
  • Starts with decent fire rate.
  • Increase bullet count upgrades apply twice, this is important for the “on hit” ability of spark.

This gun has one major drawback, long reload time, but you should never have to reload again after the first boss.

First Boss Upgrade

This build works best with spark’s “Charged Up” upgrade.

There is a 1 in 3 chance of getting this upgrade, If you dont get this upgrade, the build still works, but you’ll need to focus on bullets per shot upgrades (which are applied twice, so that is advised anyway)

Core Build (Includes TL;DR)

TL;DR If you dont care about why this works, get these upgrades:

  • Electro mage
  • Energyzed
  • Quick hands
  • Armed and Ready OR Fresh Clip (not both)
  • Kill Clip

This is the core of the build, every thing depends on these few upgrades, so get them as soon as you see them.

2 Paths

Although the order in which you get these upgrades does of course not matter, the upgrades come from 2 paths and 1 is better on its own than the other, so lets start with the best one.

Path of the Electro mage

The first upgrade you get in this path is the Electro Mage

This upgrade summons lighting every time you shoot (the upgrade says every 2 shots, but the on shoot event triggers twice because you have 2 guns)

The second upgrade you want from this path is Energized

This upgrade gives you a 25% chance per lighting bolt to get back 3 ammo.

if you, at this point, already have gotten the “Charged Up” upgrade from the first boss and/or a few bullets per shot. Congratulations, you’ll never have to reload again in your life… until you win and have to start over…

If you already have the required part of the other path (“the quick hands path”), or those upgrades aren’t available, get the rest of this path as well, It upgrades lightning, and lightning will be your main source of damage for a while.

The quick hands path

The only upgrade we want from this path is “Kill clip”.

This is unfortunately the last one. I say unfortunate because the other 3 upgrades on this path are completely useless for this build.

This upgrade will increase your fire rate with each kill, this buff resets after reloading, but if you finish the core part of this build, that will never happen; Infinite fire rate? Unfortunately the fire rate seems to be capped, but the cap is pretty high. This does mean that you can get as many upgrades as you want that decrease fire rate as trade-of.

Do I really have infinite ammo (Math for boring people)

Technically? No. But you’d have to be really unlucky and/or really bad at aiming.

Lets see how much ammo you’d get back per shot on average, one shot takes 2 ammo, so if the average is 2 or higher, you’d need to be quite unlucky to go from 32 (34 if you took “armed and ready” to get to “kill clip”) all the way to 0.

Lets assume you get 2 hits per shot (the average is probably higher due to upgrades that increase bullets per shot).

You summon 1 lighting per shot, every lightning adds 0.75 (3 ammo / 4 shots on average to trigger) to the average ammo per shot, so this is the first 0.75.

Every third lighting bolt adds 1 ammo, so that’s 0.33 per shot (total = 1.08).

But every hit has a 50% chance to summon lightning, so that’s another lightning per shot on average (assuming 2 hits), which adds another 0.75 ammo per shot on average, but these lightning bolts also count towards “charged up” which adds another 0.33 per shot (total = 2.16).

Now where it gets crazy, and incalculable (for me at least) is when you get piercing, bounce, and/or splinter. Because if 1 bullet hits multiple enemies, it counts as multiple hits. And the bullets from enemies that die do also count towards hits. From this point on, the chances of even getting bellow 20 ammo are very small.

General Upgrade Guide


  • Don’t get these upgrades, even if they also qualify for the “Good” list.
  • Any upgrades that puts your clip size bellow 20.
  • Any upgrades that decrease bullets per shot.
  • Upgrades that only upgrade clip size (you will never run out of bullets anyway).
  • Upgrades that only upgrade reload speed (the last time you reloaded was in 1996, and there are no plans for ever reloading again).
  • Upgrades that only do something after a reload.
  • Upgrades that only do something “on last ammo” (these only trigger when you shoot with 1 ammo (this will never happen)).


These upgrades work really well on this build.

  • Any upgrade that increases bullets per shot (this increases ammo return rate) (also splinter which summons bullets on enemy deaths).
  • Any upgrade that does something on hit (Example, 50% chance to freeze an enemy that got hit by a bullet) (you will be putting out a lot of bullets).
  • Any bounce or piercing upgrades.
  • Any upgrade that increases pickup range (The majority of deaths will be from lighting, so you have no control over where enemies will peacefully hand over their XP).
  • Any upgrade that upgrades lightning bolts(there will be a lot of lightning bolts).
    Any upgrade that increases the amount of lightning bolts (I like lightning bolts).
    Any synergies with lighting bolt (they are very good).
  • Prioritize lighting over bullet upgrades.
  • Feel free to get upgrades that absolutely kill your fire rate (you’ll get it back in about 10 seconds (preferably mid-late game)).


  • Summons (they’re not bad, they just don’t help this build, and the build doesn’t help them).
  • (personal) I like to keep my bullet damage high, so I can melt bosses.
  • Upgrades that only or primarily upgrade fire rate (“Kill Clip” will get you to the fire rate cap anyway).
Egor Opleuha
About Egor Opleuha 6901 Articles
Egor Opleuha, also known as Juzzzie, is the Editor-in-Chief of Gameplay Tips. He is a writer with more than 12 years of experience in writing and editing online content. His favorite game was and still is the third part of the legendary Heroes of Might and Magic saga. He prefers to spend all his free time playing retro games and new indie games.

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