Fab's Server Tweaks

Fab's Server Tweaks is a modular gameplay-tweaks mod focused on server-side quality-of-life changes, vanilla logic overrides, optional enchantment extensions, and data-driven recipe packs.

The mod is designed to work server-side, with optional client installation for matching visuals and a few client-only extras.

Mod Requirements

Dependencies

Architectury API
Cloth Config
Fabric or NeoForge
- Fabric additionally requires:
  - Fabric API

How Features Are Controlled

The mod is intentionally split across several control layers:

Config: global mod settings such as trampling rules, leash behavior, seed sharing, and piston block-entity movement.
Gamerules: per-world runtime toggles for most gameplay and vanilla-behavior overrides.
Built-in datapacks: optional feature packs for enchantments, recipes, cauldron conversions, and durability smelting.
Tags and data files: used to define targets, exceptions, item groups, stack overrides, leash categories, piston overrides, and more.

This makes it possible to run the mod in a very vanilla-like mode or enable a much broader tweak set.

Client and Server Expectations

The mod works server-side only. Vanilla clients can connect and play normally.

For the best visual experience, installing it on the client is recommended, since some custom piston and presentation logic may otherwise be shown using vanilla client visuals.

Config Features

These settings are stored in the mod config and can be viewed or changed with /fabs config.

cropTrampleMode: controls farmland trampling. Supports vanilla behavior, no trampling, or trampling immunity with Feather Falling.
eggTrampleMode: the same idea for turtle eggs.
difficulty: controls how the custom hostile mob potion-effect system scales. Can either behave the same on all difficulties or scale with world difficulty.
shareSeed: shares the world seed with players on join and allows non-moderators to use /fabs seed.
overrideNormalLead: overrides vanilla lead interaction and allows expanded leash targets.
canLeashAnimals: allows or blocks leashing animals through the modded lead logic.
canLeashMonsters: allows or blocks leashing hostile mobs.
canLeashBosses: allows or blocks leashing boss mobs.
canLeashVillagerTypes: allows or blocks leashing villagers and related types.
canLeashGolems: allows or blocks leashing golems.
canLeashPets: allows or blocks leashing tameable pets.
canPistonsPushBlockEntities: enables the custom piston logic for moving block entities with their full data.

Gamerule Features

Most of the gameplay tweaks are controlled with gamerules.

Mob Behavior and Drops

mob_grief_enderman: toggles Endermen picking up blocks.
mob_grief_creeper: toggles Creeper block griefing while still allowing explosion handling.
mob_grief_zombie: toggles zombies breaking doors.
mob_drop_equipable: toggles equipment, tools, and weapon drops from mobs.
mob_drop_full_durability: restores dropped mob gear to full durability.
mob_drops_require_player_kill: prevents mob drops unless the mob was killed by a player attack or player-caused explosion.
shulker_random_color: randomizes natural shulker colors.
shulkers_can_teleport: toggles shulker teleporting.
shulker_shell_drop_amount: fixed shell drop amount for shulkers.
villager_always_turn_into_zombies: zombies always convert villagers instead of only sometimes.
mobs_spawn_with_effects: hostile mobs can spawn with dimension- and difficulty-based potion effects.
friendly_phantoms: phantoms orbit but do not attack players.

World and Block Behavior

no_cobble_gen: alters lava and water interaction to prevent standard renewable cobblestone-style generation.
better_hoes: enables area tilling and area harvesting with hoes.
dripstone_fill_cauldron_water: toggles water dripstone filling cauldrons.
dripstone_fill_cauldron_lava: toggles lava dripstone filling cauldrons.
rain_fills_cauldron: toggles rain filling cauldrons.
snow_fills_cauldron: toggles snow filling cauldrons.
better_rail_placement: improves rail placement and shape retention.
snow_golems_survive_on_ice: prevents snow golems from melting while standing on ice.
snow_golems_generate_snow: toggles snow trail generation.
no_soliciting_sign: prevents wandering trader spawns near signs reading No Soliciting.
silk_touchable_amethyst_nodes: allows budding amethyst to be harvested.
silk_touchable_spawners: allows spawners to drop with their block entity data.
silk_touchable_trial_spawners: allows trial spawners to drop with their data.
silk_touchable_trial_vaults: allows vaults to drop with their data.
expanded_bone_meal: adds new bonemeal interactions.
sleeping_bags_enabled: enables sleeping-bag behavior for specially named beds.
safe_cant_sleep: prevents sleeping if the world currently cannot skip the night.
pet_friendly_fire: when disabled, prevents players from hurting their own tameables.
fortune_ancient_debris: changes ancient debris drops to support direct scrap-style fortune scaling.
torch_flowers_glow: toggles torch flowers glowing.

Projectile and Item Recovery

trident_with_loyalty_returns_from_void: loyalty tridents can return instead of being lost to the void.

Major Gameplay Tweaks

Pistons

The piston system is one of the largest logic overrides in the mod.

Block entities can be pushed and pulled while preserving their data.
Inventories, furnace progress, custom NBT, and stored components are transferred to the destination block.
Double chests are handled specially so they do not split incorrectly.
Single chests can move as singles without auto-merging unexpectedly.
Double chests only move if both halves move.
Two parallel pistons moving both halves in the same tick and direction are supported.
Piston behavior is further controlled through tags:
- fabsservertweaks:piston_push_blacklist
- fabsservertweaks:piston_push_whitelist
- fabsservertweaks:piston_move_override

piston_move_override specifically allows blocks with a normal DESTROY push reaction to move instead of break.

Leads and Mob Storage

Leads can leash expanded categories of entities depending on config.
Ender-enchanted leads can store a mob in the lead item and place it again later.
This applies entity data storage rather than just converting the mob to an item placeholder.

Spider Climbing

Spiders in Minecraft can usually climb on anything. This mod adds a tag to blacklist certain blocks.

fabsservertweaks:spider_not_climbable can be used to blacklist spiders being able to climb on blocks.
By default, the tag blocks spiders from climbing on:
- All ice blocks, this is applied through the #minecraft:ice tag, so it includes modded ice blocks if the tag is used by the mod author.
- All glazed terracotta blocks

Beds and Sleeping Bags

Beds named Sleeping Bag act as sleeping bags instead of spawn-setting beds.
Sleeping in one does not change respawn position.
When used, the bed is broken and dropped back as the named item.

Seed Sharing and Debugging

The server seed can optionally be shared to joining players.
A slime chunk debug entry exists on the client when the seed is known.

Item and Utility Tweaks

Lodestone compasses can teleport the player to the lodestone by consuming an ender pearl.
Using a glass bottle on an enchanting table stores one level as a reusable XP bottle.
Right-clicking that XP bottle gives the stored experience back.
Snowballs deal proper damage to water-sensitive mobs.
Aqua Affinity underwater mining is improved.
Tagged items can become cactus-immune.
Tagged items can also have stack sizes overridden to 16 or 64.
Creative players can instantly kill mobs with non-weapon attacks.
Nicknames can override the displayed chat sender name.

Enchantments

The mod includes built-in enchantment packs. Some are handled entirely through data, while others also have Java-side behavior.

Custom Enchantments Pack

Built-in pack: CUSTOM_ENCHANTMENTS

This pack is enabled by default and requires restart.

Tree Chopper: Breaks an entire tree, giant mushroom, or supported fungus-style structure using whitelist and attachment tags.
Capturing I-III: Melee weapons gain a chance to make mobs drop their spawn eggs.
Ender I: Applied to leads. Lets a lead capture and redeploy a mob.
Hammer I-III: Applied to pickaxes. Enables area mining.
Longsword I-III: Increases entity interaction range.
Long Legs I: Increases step height.
Reach I-III: Increases block reach. Works on chest armor and Elytra.
Springy I-III: Increases jump strength.
Swiftness I-III: Increases movement speed.

Ore Miner Pack

Built-in pack: ORE_MINER

This pack is disabled by default and requires restart.

Ore Miner I: Vein mines connected tagged ores and clusters.

Vanilla Enchantment Overrides Pack

Built-in pack: VANILLA_ENCHANTMENTS_OVERRIDES

This pack is disabled by default and requires restart.

It overrides several vanilla enchantments:

Efficiency up to level X
Fortune up to level V
Looting up to level V
Sharpness up to level X

These are not just higher caps. Their data definitions also adjust scaling behavior.