Confluence 1.21.1 Update Notes (October 2026)

These notes apply to 1.21.1 only.

Highlights

• The Twins reworked: new combat synergy, sweep and flame attacks, projectile visuals, and encounter resolution.
• Creative Boss aggro tool: makes testing Boss fights and building maps much easier.
• Towns and NPCs improved: Shadow Candles, trade-price display, line-of-sight targeting fixes, town spawn suppression, and more town critters.
• Clentaminator and Terraformer: more conversion rules plus a quick-buff potion keybind.
• Global achievements: achievements are now global instead of being recorded per save.
• Stability fix: client memory usage no longer keeps climbing after changing dimensions or leaving a world.

New Content and Progression

• Added the Clentaminator and Terraformer with expanded environment conversion rules.
• Completed the Shadow Candle: it can be held in either hand and, when placed and lit, disables town spawn protection.
• Added the Abyssal Scale weapon series and several work-in-progress weapons.
• The Blood Moon no longer spawns at the same time as the Eye of Cthulhu.
• Removed the old Star Phase system.
• Achievements now use a global progress store instead of being duplicated per save.

Bosses and Combat

• Reworked The Twins' fight, rendering, health bar, and encounter resolution.
• Adjusted The Twins' sweep, flame, and linked projectile attacks for clearer combat pacing.
• Unified Boss health-bar configuration and improved multiplayer Boss encounters.
• Added the creative Boss aggro tool for testing and map making.
• Reorganized Martian enemy and multi-part hit logic; fixed the Magic Rope and Wall of Flesh behavior.
• Added combat sound effects for better hit feedback.

Difficulty and Progression

• Unified mob difficulty: Easy, Normal, and Hard now map to Classic, Expert, and Master.
• Rewrote For the Worthy difficulty masking so the displayed name matches the actual difficulty.
• Expanded enemy and Boss attribute scaling, including armor, toughness, movement speed, flight speed, knockback resistance, and targeting range.
• Fixed mob difficulty incorrectly increasing due to world time, chunk dwell time, or moon phase.
• Adjusted duck and wasp behavior to reduce wasted AI work and stutter.

NPCs, Towns, and Trading

• Improved town generation, unified town population checks, and added town hostile-spawn suppression.
• Towns now spawn more critters while preserving each species' original spawn conditions.
• Shadow Candles can be held in either hand and disable town spawn protection when placed and lit; recipes, drops, models, and bilingual tooltips are complete.
• Fixed NPC trade-price tooltips: NPC goods show only the buy price, and player items show only the actual sell price.
• Server sell offers now account for NPC mood and the refund from the current trade.
• Fixed shop biome, graveyard, and height conditions reading the NPC's position incorrectly.
• Fixed NPCs targeting through walls and locking onto invisible targets.
• Fixed the Fisherman's nameplate position while standing.
• Improved reforge interaction, modifier queue ordering, and transition effects.
• Fixed reforge line of sight, initial NPC appearance, and coin-drop issues.
• Fixed being unable to craft in the inventory after leaving the Bestiary.
• Fixed the Old Man not spawning.

World and Environment

• The Clentaminator and Terraformer support more conversion rules.
• Added a quick-buff potion keybind.
• Fixed Dart Traps failing and being distributed unevenly.

Items and Equipment

• Nerfed the repeater crossbow.
• Updated solution textures.
• Adjusted movement-accessory trigger order, added Wool Boots and Deodorant, and improved the Plant Fiber Rope Guide.
• Updated the Abyssal Scale weapons and several item texture sets.
• Added many item textures and tooltips.
• Adjusted loot-drop percentages and fixed armed NPC rendering.

Quality of Life and Fixes

• Fixed several entity orientations and translation strings.
• Updated several item tooltips.
• Fixed several particle emission directions for better visuals.
• Fixed functional candles continuing to apply effects after being extinguished.
• Fixed graveyard generation bypassing existing deny results and ignoring entity-space checks.
• Fixed pets and rescued NPCs being counted in mood-neighbor calculations.

Performance and Compatibility

• Fixed a client memory leak that retained the old world and player data after changing dimensions or leaving a world.
• Reduced AI overhead for several enemies to improve performance.
• Updated particle effects for better visuals and stability.