The Ultimate Sacrifice

"The culmination of pure dedication. A machine unmatched by any other."

Overview
The Ultimate Sacrifice is a long-anticipated game mechanic and Ultimate-tier upgrader obtained upon performing the titular game feature. The Ultimate Sacrifice was added on the 8th of March, 2017 and it was first announced officially on the Berezaa Games Forums.

The Ultimate Sacrifice acts as a Resetting Device which is a type of item that resets all Machine tags and Status effects, allowing the user to propel themselves into much higher cash suffixes, progressing further into the game.

Its Resetting mechanic is paired with a small multiplier of x2.5 and an additive of $5000. In addition to this, it also has a few bonus attributes, such as larger multipliers of x25 and x50 if the upgrade count of an ore is 0, as well as being able to loop upgrade ore until $1qd.

Ultimate Sacrifice Game Mechanic
The Ultimate Sacrifice is meant to act the same as and work alongside with the Tesla Resetter. The Ultimate Sacrifice requires the player to be life 1001 or higher and needs to click three GUI buttons to verify. Upon performing The Ultimate Sacrifice makes you start on life 1 again, the same way you originally started Miner's Haven (with the following items in your inventory: Basic Furnace, Basic Iron Mine, Basic Conveyor, 10 Ultimate Conveyors, along with several items you can keep with you.

The Ultimate Sacrifice can only be performed once. After performing The Ultimate Sacrifice, you will gain the ability to craft Reborn Fusions at the Craftsman, such as Diamond Breech Loader and Eternal Fracture. The crafting of these items requires the use of Research Points to unlock the item as well as multiple copies of the fused items.

Like with Rebirthing, The Ultimate Sacrifice cannot be undone.

What Will I Keep?
Berezaa released an FAQ page on Berezaa Games forums (that are now down forever) that further answers this question. Here are the following assets you keep after performing the Ultimate Sacrifice:
 * Research Points and uC (Unobtanium Crystals).
 * Mystery Boxes, Lucky Clovers, & Twitch Coins.
 * Your ore limit.
 * Fabled-tier Items.
 * Soulbound items, such as Discord Conveyors, Statue of Knowledge, etc.
 * The recipes to craft both the Void Drive and Coliseum Catharsis (you will not need to complete either challenge again.)

Sacrifice Escrow
For your limited-time seasonal items, those items are held in escrow and will be returned to you when you reach Life s-100 (you obtain the "s-" life prefix when you Sacrifice). The items that are held in escrow are listed below: For the mystery-box exclusive vintages, reborn items, Ultimate-tier items, and uC Shop Items, they are gone forever. Good luck getting them back.
 * Exotic and Collectible items
 * Reborn-proof Contraband items, including THE UNDERTAKER.
 * Code-exclusive items, such as the Ancient Conveyor.
 * Paid items, like the Pineapple Refiner.
 * Twitch items, including the Twitch Scanner and Twitch-Powered Upgrader.
 * Luxury items.

Milestone Rewards
Berezaa has acknowledged the users who have rebirthed far more than 1,000 times for the sake of it. Here are the special rewards along with the Ultimate Sacrifice for users who have reached these milestones:

Keep in mind that it's not worth the energy to rebirth several times just to hit a life 2000, 5000, or 10000+ milestone or above just to receive the perks as it will take more times to do the rebirths to hit the milestones rather than compensate for not receiving the perks that come along with the milestones.

Worth it?
By the time you reach your 1,001st life, you should have more than enough experience on Miner's Haven to be able to start all over again and regain all the progress you have lost much more efficiently than you did when you first started Miner's Haven, especially with The Ultimate Sacrifice in your inventory, adding a large sum of money and massively multiplying ore value. You can always regain Reborn items again. You will also have access to Reborn Fusion items which have unique designs and powerful effects, which were inherited from both of the fused items. You also receive a baseplate size increase of 6 units in both directions.

The only time where you should not Sacrifice immediately is if a limited-time item you own has not yet been made Sacrifice proof, such as seasonal rebirth items.

History of the Idea
The thought of The Ultimate Sacrifice was made by the user MythicShad0w and the Ultimate Sacrifice model was created by the user Negativize on the Berezaa Games community forums. The Ultimate Sacrifice was announced in early August 2016 and was released in March 2017.

It started off as sacrificing everything but Vintage, Exotic, and Collectible items JUST FOR the Ultimate Sacrifice. Berezaa pushed back The Ultimate Sacrifice In October 2016 but then, he considered save slots, having the same data on two slots and performing The Ultimate Sacrifice on one slot, and keeping all your data on another slot which does not seem like a bad idea.

Berezaa now realized how complicated The Ultimate Sacrifice would be and that this new mechanic would need more to it and more planning. After October, Berezaa stayed silent about The Ultimate Sacrifice until January when he realized where he wanted to take The Ultimate Sacrifice and announced March as the official release time for The Ultimate Sacrifice. On January 14th, Berezaa released this forum post where he releases the final plans for The Ultimate Sacrifice. On February 9th, 2016, Berezaa released the final images of the new items to be released in the update which includes 5 new fusion reborn items and 5 new slipstream items. Berezaa also later shown off items like the Hyper Mine, Assembly Unit, and Iron Refiner, the effects were unknown. On February 25th, 2017 Berezaa created the Twitter account @HavenRBLX where he showed off a new GUI design for Miner's Haven.

Trivia

 * The Ultimate Sacrifice upgrader is destroyed in The Second Sacrifice. What's left of it will be yours to keep in the form of the Statue of Sacrifice.
 * Once you perform the sacrifice, the camera zooms out, plays this sound, and then zooms in to the point when you can only see your head, and then die.