Three Paper plugins
Clay Mobs, Clay Duels and Clay Lobby. One jar each, no dependency chain, every feature in the free download.
See all threeDevlogs and tutorials
How the plugins get built, how to configure them, and the occasional thing that went badly wrong on a live server.
Watch on YouTubeModel assets
Blockbench models and texture packs made for my own servers, packaged up so you can drop them into yours.
Browse modelsLatest on the channel
All videos →
The Discord is where everything happens
Plugin support, model requests, release notes, and early builds before they land on the site.
discord.gg/bznMms5mPUClay Mobs
Write a boss in a file and it behaves like one. Config-driven mobs, ~110 mechanics, real pathfinder AI, and packs in two formats side by side.
0.1.0
Paper 1.21.4+
MIT
Clay Duels
Everything a duels server needs, in one jar. Ranked queues, replays, tournaments, wagers, and arenas that rebuild themselves exactly.
1.13.0
Paper 1.21.4+ / 1.8.8
MIT
Clay Lobby
The lobby, the network glue and the editor — all in the box. Twelve modules, proxy companions, and forms instead of chest menus.
1.0.0
Paper 1.21.9+
Velocity / Bungee
Built on the same three convictions
One jar, no dependency chain
None of the three need Vault, WorldEdit, Citizens, a party plugin or a packet library. Optional integrations are detected at runtime and skipped when absent.
Free, all of it, forever
Every feature on this site is in the jar you download. No premium build, no paywalled module, no licence key, no unlock for the editor or the replay viewer, and no upsell in chat. Nothing calls home either.
Everything clickable is also typed
No feature sits behind a GUI only — which also means Bedrock players are never stuck at a menu they cannot use.
Complementary, not overlapping
Clay Mobs is the content, Clay Duels is the competition, Clay Lobby is the hub in front of both.
| Clay Mobs | Clay Duels | Clay Lobby | |
|---|---|---|---|
| Version | 0.1.0 | 1.13.0 | 1.0.0 |
| Server | Paper 1.21.4+ | Paper 1.21.4+, 1.8.8 build | Paper 1.21.9+ |
| Java | 21 | 21+ | 21 |
| Storage | YAML packs | SQLite / MySQL | Flatfile / SQLite / MySQL |
| Required dependencies | None | None | None |
| Licence | MIT | MIT | — |
Get Support on Discord
Bug reports, config questions, feature arguments and release notes all live in the same place.
discord.gg/bznMms5mPUContent · Clay Mobs 0.1.0
Write a boss in a file and it behaves like one.
Config-driven custom mobs, skills and spawning for Paper. Existing MythicMobs-format packs drop in unchanged; Clay Mobs' own format puts a whole boss in one file.
0.1.0
Paper 1.21.4+
Java 21
No dependencies
MIT
Who it is for
Servers that write their own content, keep it in version control, and want to know exactly which lines the plugin could not read.
Two formats, loaded side by side
A file is native because of its first line — effmobs: 1 — not its folder, so a server can convert one pack and keep the rest. /effmobs convert rewrites a pack without touching the original.
~110 mechanics, ~50 targeters, ~80 conditions
Damage, heal, potions, particles, summons, projectiles, teleports, auras, variables, signals, boss bars, commands — across ~30 triggers. /effmobs components prints the live registry.
Behaviour, not just a Type:
AI selectors compile into 19 real pathfinder goals and 12 target selectors. Threat tables drive targeting, factions carry a relation matrix and per-player standing, and targets: [] is how you write a mob that never attacks.
Spawning you opt into
Random spawn rules, placed persistent spawners, vanilla spawn replacement rather than addition, and a distance/time despawn policy — each off by default and gated separately.
It tells you what it could not load
Every diagnostic carries a file and a line. Unknown mechanics are reported by name and frequency, so the gaps that matter to your packs are the visible ones.
Extensible from your own plugin
effmobs-api has no platform dependencies. Register your own mechanics, targeters, conditions, placeholders and triggers into the same registries the core uses.
One file instead of six
The skill lines are identical in both formats; what changes is the envelope. Options are grouped and schema-checked, and AI priority is list order rather than numbers you maintain by hand.
effmobs: 1
mob:
id: emberwarden
type: wither_skeleton
display: "<gradient:#c67139:#ffc6a5>Emberwarden</gradient>"
health: 420
damage: 9
ai:
goals: [float, melee_attack, look_at_player]
targets: [nearest_player]
skills:
- onTimer 60: ring{particle=flame;radius=3}
- onDamaged: cast{skill=ember_burst;chance=0.3}
drops:
- ember_core 1 0.15
$ /effmobs coverage
loaded mobs 41/43 skills 118/121 items 12/12
failed Mobs/legacy/warden.yml:24
unknown mechanic "disguise" (3 packs)
failed Skills/aoe.yml:11
composite condition "&&" not supported
failed DropTables/rare.yml:7
unknown targeter "@NearestStructure"
Not implemented yet
Disguises, health bars, and composite && / || conditions.
Clay Mobs 0.1.0
Paper 1.21.4 or newer · Java 21 · no required dependencies · MIT
Clay Mobs is an independent project, not affiliated with or endorsed by MythicMobs. It reads a compatible file format implemented from public documentation only. Version 0.1.0 is early: feature-rich, but younger than the other two plugins here.
Competition · Clay Duels 1.13.0
Everything a duels server needs, in one jar.
Challenges, ranked queues, parties, kits, self-rebuilding arenas, spectating, replays, Elo, tournaments and wagers — without Vault, WorldEdit or a party plugin. Drop the jar in, make one arena, duel.
1.13.0
Paper 1.21.4+
1.8.8 build
SQLite / MySQL
MIT
Who it is for
Competitive servers that want the whole package — and want their kits, modes and arenas to be files they can read.
Setup is one arena
First run writes a working config plus sixteen ready-made kits and modes: Classic, NoDebuff, Soup, Archer, UHC, Crystal, Combo, Sumo, Boxing, Build UHC, Bed Fight, The Bridge, Spleef, TNT Run, Rising Lava and Random Fortune.
Replays, in the arena they happened in
Pause, speed, seek and jump between kills. The recording is a compact list of what changed, so ten minutes of a 2v2 costs tens of kilobytes. Retention is capped by both age and count.
Tournaments on one arena
Single-elimination, seeded by rating, byes to the top seeds, the best two kept apart until the final. Bouts start as arenas free up, so a sixteen-player event needs one. The bracket is written to disk on every result and survives a restart.
97 rules, every one live
Combat, health, items, projectiles, movement, world editing, resets, round formats, win conditions and hazards. Click to edit or type the command. Modes and kits are plain YAML, so a competitive setup can live in git.
Arenas that rebuild exactly
Every block change is journalled before it happens — fire, fluids, pistons, explosions — and replayed in reverse afterwards. If a journal is ever incomplete, the arena is rebuilt from a captured baseline.
Statistics with real scopes
Recorded as it happens against overall, duel, <mode>, ffa and <arena>, so a leaderboard is one indexed lookup. Averages have a ten-game floor. ~40 PlaceholderAPI placeholders expose all of it.
The parts that must not go wrong
Duels move players' real inventories around, so those paths are built on hard rules rather than best effort.
State is stored before anything moves
The snapshot goes to the database first; only then is anyone teleported or given a kit. A crash mid-duel leaves an unambiguous record of who is owed what.
Players never actually die
A killing blow is intercepted and turned into an elimination — no dropped inventories, no respawn screen to get stuck on.
Owed items live in exactly one place
In an inventory, in escrow, or in /duelinbox — never on the floor. Claiming takes the database row first, so a stack cannot be claimed twice.
A wager resolves exactly once
One compare-and-set in the database. An unknown economy answer is never retried — the wager is parked for /dueladmin economy rather than guessed at.
Running alongside what you already have
One line of config. Integrated mode only ever makes Clay Duels do less, so it is safe to switch on partway through a server's life — duels, arenas, kits, modes, ratings, wagers and replays are identical in both.
| dedicated (default) | integrated | |
|---|---|---|
| Lobby hotbar and sidebar | Available | Never |
| Teleport on join | Available | Never |
/d, /queue, /ranks, /replay | Kept | Handed back to the server |
| Where a duel may start | Anywhere | Your allow and block lists |
It never takes a scoreboard away from another plugin, anything that pulls a player out of the world fires a cancellable event first, and if duels run their full length with nobody taking damage it says so instead of leaving you to guess.
Clay Duels 1.13.0
Paper 1.21.4 or newer, Java 21+ · a separate Spigot 1.8.8 build from the same sources · 502 tests passing across 48 test classes
Optional integrations only: PlaceholderAPI, Vault and an economy, and a Discord webhook. SQLite by default; MySQL or MariaDB when several servers share data. Migrations are automatic and forward-only.
Hub · Clay Lobby 1.0.0
The lobby, the network glue and the editor — all in the box.
Twelve modules over Paper 1.21.9, with Velocity and BungeeCord companions and an in-game editor made of real form controls. No NMS, no packet library, no Citizens.
1.0.0
Paper 1.21.9+
Java 21
Velocity 3.x & 4.x
Flatfile / SQLite / MySQL
Why the version floor is the story
1.21.9 is where Mannequin — a first-party, player-shaped NPC entity — landed, and 1.21.8 is where Paper's Dialog API did. Between them they mean no NMS, no packet library, no Citizens, no capability probes or fallback code paths, and an editor made of real form controls rather than chest menus pretending to be them.
What is in it
| Module | What it does |
|---|---|
| Lobbies | Named lobbies, several spawn points each, first / random / round-robin selection, and a safe teleport that will not drop somebody inside a wall |
| Regions | Cuboid, cylinder, sphere and global shapes over a chunk-bucketed spatial index, with thirteen protection rules and priority where they overlap |
| Menus | Chest GUIs that are dupe-proof by construction, not by remembering to cancel an event |
| Items | Hotbar items locked into their slots, with requirements and per-click actions |
| Display | Scoreboard, tab list, boss bar, and an action-bar arbiter so four features do not fight over one line |
| NPCs | Four engines — mannequin, floating item, floating block, floating text — all first-party, all click-routable |
| Holograms | TextDisplay holograms never written to the world save, so a crash cannot leave duplicates |
| Movement | Launch pads, double jump, portals |
| Player hider | See everyone, staff only, or nobody |
| Proxy | Velocity and BungeeCord companions with an authenticated channel and proxy-authoritative queues |
| Editor | Edit seven kinds of object in game, in real dialogs, and save back to YAML with the comments intact |
Every feature is a module with its own block under modules:, and enabled: false genuinely stops it — its listeners are never registered, and anything that wanted it is skipped with a line naming what it wanted.
Text a player typed can never become formatting
A name, a chat line, a queue id off the wire: all inserted as literal characters, unable to introduce a colour or a clickable link. Enforced at construction by a three-level trust type, not by remembering to escape.
One editor, seven permissions
Per-type on purpose: a build team can be trusted with holograms and lobby spawns without also being handed the protection rules.
Storage you can swap
Flatfile, SQLite or MySQL behind one interface, all storing the same document — so switching needs no converter, and the flat file stays readable in a text editor.
Anonymous bStats, nothing else
Server software, Java version, player count, rough location, which modules are on. No world names, no player names, no IPs, nothing typed into a config. Opt out in either place; both are honoured.
Built against the oldest version it claims
apiCheck reads the compiled bytecode against an index of what Paper 1.21.9 actually had and fails the build on anything newer — which is why there are no capability probes anywhere in the plugin.
Migration that shows its work
/veplobby-import reads another lobby plugin's setup and reports what it would do before it writes anything.
modules:
lobbies: { enabled: true }
regions: { enabled: true }
npcs: { enabled: true }
holograms: { enabled: true }
proxy:
enabled: true
secret: "<same value on every backend>"
player-hider:
enabled: false # listeners never registered
screenshot — the Dialog-API editor
form controls, not a chest menu
form controls, not a chest menu
Clay Lobby 1.0.0
Paper 1.21.9 or newer · Java 21 · no required dependencies · 519 tests · boots a real Paper 1.21.9 in ~79 ms
Every phase is written, building and booting, with seventeen modules verified running together on a live server. What remains is a standing list of things that build, test and boot but have not yet been seen work with a client attached; docs/STATUS.md keeps that list and is the honest document of the project.
FetzCraft · Models
Model assets, free to use.
Boss rigs, weapons and armour, built for my own servers and packaged so they drop straight into yours. Spin any of them here before you download — each pack ships the model, the texture and the resource-pack files.
Boss rigs
Animated Blockbench entities, texture sheet included.
Hollow King
156-cube boss rig with 13 animations. 1024×512 texture, Blockbench source included.
Blockbench
Free
Sporefang
179 cubes, 12 animations and a 1024×1024 texture sheet.
Blockbench
Free
Storm Herald
199 cubes across a jointed rig, 10 animations, 1024×512 texture.
Blockbench
Free
Each viewer reads the .bbmodel file itself — drag to spin, scroll to zoom. Animations are in the file but not played here. Full packs are placeholder links until you drop the zips into downloads/models/.
Items and equipment
The Frostreaver set — a runeblade and the four regalia pieces that go with it. These are CraftEngine items: the pack ships the item definitions, the Java models and every texture, so the whole set drops into a server as one folder.
Frostreaver
71-cube runeblade on a netherite sword. +9 attack damage, 2500 durability, 128×128 texture.
CraftEngine
Sword
Free
Frostreaver Helm
21 cubes, worn as a real 3D model rather than a flat armour layer. +4 armour, +3 toughness, 1400 durability.
CraftEngine
Regalia
Free
Frostreaver Cuirass
25 cubes over a netherite chestplate. +9 armour, +3 toughness, 2000 durability.
CraftEngine
Regalia
Free
Frostreaver Greaves
20 cubes over netherite leggings. +7 armour, +3 toughness, 1900 durability.
CraftEngine
Regalia
Free
Frostreaver Sabatons
22 cubes over netherite boots. +4 armour, +3 toughness, 1600 durability.
CraftEngine
Regalia
Free
These viewers read the Minecraft Java model JSON and pull the textures straight out of models/items/, so what spins here is exactly what the client draws. Every button downloads the same fetzitems.zip — the whole set in one file, including the item configs, the flat 32px inventory icons and the worn armour layers, which are 2D by design and have no model to show.