Advancement Multiplier

Every advancement you earn doubles your drops. Permanently.

Start with 1x. Kill a mob: 2x. Mine stone: 4x. Craft a diamond pickaxe: 8x. By the time you've cleared the End, you're drowning in millions of items per drop. Get all 120 tracked advancements and you hit 4.6 quintillion multiplier.

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How It Works

Each of the 120 tracked advancements across Adventure, End, Husbandry, Nether, and Story adds one doubling to your multiplier. The math is simple: 2^n where n is your advancement count.

Advancements	Multiplier
1	2x
5	32x
10	1,024x
20	1.0Mx
30	1.1Bx
40	1.1Tx
50	1.1Qx
62+	4.6Qix (max)

The multiplier applies to all loot: mob kills, block breaks, fishing, chest loot, and more. The more advancements you earn, the more absurd it gets.

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Features

• Exponential scaling: each advancement exactly doubles your multiplier, no diminishing returns
• Bossbar display: always-visible multiplier tracker with clean K / M / B / T / Q / Qi formatting
• Scoreboard integration: adv.count and multiplier.max objectives auto-created for datapack use
• Cascade drop fix: beds, doors, and tall plants both drop multiplied (the auto-broken half is covered too)
• Death protection: your own death drops are never multiplied
• Relog safe: stacks survive save/reload via a codec range patch; nothing disappears on world close
• Resync command: /advmultiplier recalculate to force a full recount if anything desyncs

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Tracked Advancements

All 120 vanilla advancements across five categories are tracked:

• Adventure: 46 advancements
• End: 8 advancements
• Husbandry: 29 advancements
• Nether: 22 advancements
• Story: 15 advancements (root excluded)

Root advancements (story/root, nether/root, end/root) are intentionally excluded as they grant automatically without player action.

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Stack Size

This mod includes the same codec and container stack-size patches as the standalone Unlimited Stacks Mod. If you're using both, they are fully compatible (the patches are identical and Mixin handles deduplication cleanly).

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Compatibility

Minecraft	26.1.2
Loader	Fabric 0.19.2+
API	Fabric API required
Side	Required on both client and server
Java	25+

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For Server Operators

The scoreboard objectives adv.count and multiplier.max are created automatically on server start. You can reference multiplier.max from datapacks or command blocks to read the current multiplier for the #multiplier fake player.

The /advmultiplier recalculate command recounts all tracked advancements from scratch, useful after /advancement grant commands or if a player's score desyncs.

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Known issue (unresolved)

Once your multiplier pushes a drop's true count past what a 32-bit stack can represent (~2.1 billion, around advancement 31+), splitting, dragging, or merging that stack in your inventory can leave the number on the stack not matching what you actually have. Minecraft's stack count is a 32-bit number, and multiplier values in the billions/quintillions blow straight past it. I've been unable to find a fix that doesn't reintroduce other breakage, and there's no ETA on one.

Workaround: avoid manually splitting or dragging mega-stacks in your inventory. Placing/using blocks normally, and picking up fresh drops, is unaffected.