One Block To End All One Blocks

One Block to End All One Blocks is a quest-driven one block survival mod for Fabric 1.21.4. Start with a single block in a void world — break it, and it regenerates with a new drop based on your current phase. Work through 6 phases of escalating blocks, mobs, and quests to progress from a dirt hut to a full survival world built from nothing.

Features

6 phases with cumulative block pools — each phase adds new drops on top of the last
4 quests per phase tracking crafting, mining, kills, and inventory — progress is automatic via Minecraft’s stat system
Boss waves spawn at major phase milestones to keep you on your toes
Quest Book (J key) with a full GUI — view active quests, block/mob pools, leaderboard, stats, and island management
HUD overlay showing current phase and quest progress, with configurable position, scale, and toast notifications
Multiplayer & Server Ready

Each player gets their own island, 250 blocks apart
Visit other players’ open islands with /oneblock visit
Full team system — create a team, invite players, manage members
Island merging — when two teammates physically build a bridge connecting their islands, the mod detects it automatically, advances both players to the next phase, and broadcasts the achievement server-wide
Server Friendly

Auto-start on join (configurable), or players choose to start/spectate
Admin panel for ops to manage player phases and resets in-game
Fall safety net — players who fall into the void are teleported back
PersistentState saving — all progress survives restarts
Getting Started

Create a Superflat world using the Void preset. Break your block. Press J.

Required: Fabric API