Just Trial Spawners

A full-featured Forge 1.20.1 backport of Minecraft 1.21's Trial Spawner and Vault. Brings trial spawners, vaults, breeze, bogged, wind charges, ominous mode, trial-themed mob effects, and mace enchantments to your 1.20.1 world. This does NOT add any worldgen, it is primarily directed at packmakers.

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Why Another Trial Chamber Backport?

Just Trial Spawners was built to be a production-ready, modpack-friendly backport with faithful 1.21 behavior. It includes the full state machine, all the mob effects, all the enchantments and the ominous item spawner system.

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Features

Trial Spawner

A complete recreation of 1.21's trial spawner with the full state machine:

• Detects players within a configurable range
• Spawns mobs in waves with per-player scaling
• Ejects rewards on completion (consumables + keys)
• Transforms into ominous mode when a player with Bad Omen approaches
• Ominous item spawner system — periodically drops items above players/mobs during the fight
• Right-click with a spawn egg to set the next spawn mob type
• Custom item renderer shows a spinning mob preview in your hand and in GUIs
• Tooltip displays the currently configured mob

Vault

• Trial Key / Ominous Trial Key activation
• Per-player reward tracking — each player gets one reward per vault
• Ominous vault variant with upgraded loot
• Proper cutout rendering for transparent textures

Mobs

• Breeze — Aerial mob with authentic 1.21 AI: long jump, slide, shoot wind charges, stuck detection
• Bogged — Skeleton variant that shoots poison arrows; shearable for mushrooms via datapack-configurable loot table
• Wind Charge / Breeze Wind Charge — Projectile entities with authentic 1.21 knockback physics (eye-height direction vectors, line-of-sight falloff)

Items

• Trial Key / Ominous Trial Key
• Breeze Rod — Dropped by breezes, crafts into wind charges
• Wind Charge — Throwable projectile that creates a wind burst explosion and triggers redstone components (buttons, levers, trapdoors, doors, fence gates)
• Ominous Bottle — With amplifier system (I-V); higher amplifiers grant longer Bad Omen duration (up to 10 minutes)
• Breeze / Bogged Spawn Eggs

Mob Effects (all with custom textures)

• Trial Omen — Converted from Bad Omen at trial spawners; activates ominous mode
• Wind Charged — Creates a wind burst explosion on death
• Weaving — Spawns cobwebs around the entity on death
• Oozing — Spawns slimes on death
• Infested — Chance to spawn silverfish when hit

Enchantments

• Density (I-V) — +1 damage per level; incompatible with Sharpness/Smite/Bane
• Breach (I-IV) — Bypasses armor effectiveness via damage multiplier
• Wind Burst (I-III) — Triggers a wind burst explosion on hit (treasure-only enchantment)

Creative Tab

The Just Trial Spawners creative tab includes:

• All blocks, items, and entities
• Pre-configured trial spawners for 36+ hostile mobs (zombie, skeleton, creeper, spider, cave_spider, enderman, witch, slime, magma_cube, blaze, ghast, wither_skeleton, stray, husk, drowned, zombie_villager, phantom, pillager, vindicator, evoker, ravager, vex, guardian, elder_guardian, shulker, hoglin, zoglin, piglin_brute, piglin, zombified_piglin, endermite, silverfish, warden, breeze, bogged, wither)
• All 5 amplifier variants of the Ominous Bottle

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Commands

Admin-only commands for configuring trial spawners:

/trialspawner edit                              - Edit held trial spawner using a GUI
/trialspawner edit <pos>                        - Edit a placed trial spawner
/trialspawner give <entity> [total] [sim] [tb]  - Give a pre-configured spawner item
/trialspawner addmob <pos> <entity> [weight]    - Add a mob to a placed spawner
/trialspawner setconfig <pos> <key> <value>     - Set a config value
/trialspawner info <pos>                        - Show current configuration
/trialspawner clearmobs <pos>                   - Clear all spawn potentials

Configuration

Server-side config located at config/justtrialspawners-server.toml:

[trial_spawner]
    # Cooldown in ticks after trial spawner completes (default 36000 = 30 minutes)
    cooldown_ticks = 36000
    # Player detection range in blocks
    detection_range = 14
    # Mob spawn range around the spawner
    spawn_range = 4
    # Enable ominous trial spawner mode (triggered by Bad Omen)
    ominous_enabled = true

[wind_charge]
    # Multiplier for wind charge knockback strength
    knockback_multiplier = 1.0

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License

Released under the MIT License. You are free to use Just Trial Spawners in any modpack, private or public, without permission.

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Credits

• Mojang — for the original 1.21 Trial Chamber features
• Breakin Blocks — development and backport
• FTB Team — FTB Library (NBT editor integration)
• Architectury API Team — Architectury API

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Source & Issues

Found a bug? Want to contribute? Visit the GitHub repository.