NeoSync

One mind. Many bodies.

NeoSync brings the legendary Sync experience to NeoForge 1.21.1.

Grow extra bodies, or shells, each with its own inventory, experience level, and gamemode. Swap your consciousness between them at will. Die in a shell? You wake up in another. Leave one parked in the Nether while you mine the Overworld. Keep a spare set of enchanted gear loaded in a shell halfway across the server. The possibilities are yours.

How it works

Craft a Shell Constructor and place it down.
Provide a genetic sample — right-click with an empty hand. > ⚠️ With default config this costs 20 HP (40 in hardcore). Hold a totem, eat a golden apple, or flip warnPlayerInsteadOfKilling in the config if you'd rather not die for science.
Power the Constructor. Place a Treadmill next to it, lure a pig or wolf onto the front block, and piggawatts flow. Or hook it up to any Forge Energy source from your favourite tech mod.
Craft a Shell Storage, place it, and feed it redstone or FE.
Walk into an open Shell Storage and a radial shell menu appears — pick your destination body and sync.

Features

Cross-dimensional syncing. Park shells in the Overworld, Nether, End, or any modded dimension and sync between them instantly.
Per-shell inventory, XP, and gamemode. Each shell is a fully independent body with its own loadout and progression.
Death handoff. If a shell dies, you auto-sync back to your original body or to a random remaining shell if the original is gone. Shell deaths don't count toward your death counter.
Automation support. Pipe armor and tools into a Shell Storage to equip the parked shell, or pull gear back out.
Dye your storages. Right-click a Shell Storage with dye to color-code it makes spotting "the mining shell" across a dozen containers easier.
Configurable sync priority. On death, auto-sync to the NATURAL, NEAREST, or dye-color-matched shell of your choice.
Flexible power. Shell Storages accept raw redstone signal and/or FE. Treadmills output FE to any energy-accepting block.
Comparator output. Containers emit signal based on either build progress or inventory fullness — right-click with a wrench (stick by default) to toggle. ~~~~

Blocks & Items

Block / Item	Purpose
Shell Constructor	Consumes FE to grow a new shell from your genetic sample.
Shell Storage	Houses a shell; walking in opens the radial selector. Needs power to keep the shell alive.
Treadmill	Two-block structure. Lure an animal on; it walks; FE flows.
Sync Core	Key crafting ingredient — combine with gray concrete to make either shell container.

Mod Integration

JEI — in-depth info panels on every sync block explaining the workflow, plus a Treadmill Energy Sources category listing every supported entity and its FE/tick output.

Jade — crosshair tooltips for Shell Constructors, Storages, and Treadmills showing owner, build progress, color, powered state, and energy.

Both are optional. NeoSync runs fine without them.

Configuration

Everything is tunable in config/neosync-common.toml. A taste of the knobs:

Key	Default	Effect
`enableInstantShellConstruction`	`false`	Instant shell builds in creative.
`warnPlayerInsteadOfKilling`	`false`	Don't kill low-HP players on fingerstick.
`fingerstickDamage` / `hardcoreFingerstickDamage`	`20` / `40`	HP consumed per shell sample.
`shellConstructorCapacity`	`256000`	FE needed to finish a shell.
`shellStorageCapacity` / `shellStorageConsumption`	`320` / `16`	FE buffer + per-tick drain to keep a shell alive.
`shellStorageAcceptsRedstone`	`true`	Accept raw redstone signal as power.
`shellStorageMaxUnpoweredLifespan`	`20`	Ticks a storage holds a shell without power.
`energyMap`	chicken=2, pig=16, player=20, wolf=22, villager=25, creeper=80, enderman=160	FE/tick each entity generates on a treadmill.
`syncPriority`	`NATURAL`	On-death auto-sync target: `NATURAL`, `NEAREST`, or any dye color.
`wrench`	`minecraft:stick`	Item that toggles a container's comparator output.

Credits & License

Original concept: iChun — the original Sync mod.

Fabric reimplementation: Kir_Antipov.

NeoForge 1.21.1 port: BreakinBlocks.

Licensed under MIT. See the LICENSE file for details.