The Sulfur Caveis the centerpiece of this update, turning the biome into a richer and more atmospheric underground destination. You can now discover glowing Sulfur Tear, drifting Vapor Moss, reactive Fuming Fungi, and valuable sulfur and cinnabar resources scattered through the depths.
The cave is also more dangerous and more rewarding to explore. Brimstings now haunt the darkness with eerie movement and sounds, while five sulfur-touched vanilla mob variants make every encounter more threatening. Defeating them can reward Sulfur Dust, Cinnabar Dust, and Sulfur Pollen, opening up new crafting, fuel, and brewing opportunities.
To help players survive the hazards, this update also introduces the Respirator helmet for resisting nausea and poison, alongside Crackers, sticky explosives that cling to walls and ceilings before detonating. All of this is wrapped in a stronger sulfur atmosphere, with new particles, sounds, item visuals, ambient cave life, and updated cave generation making the Sulfur Cave feel like a major new place to explore.
Release Date: 24 June 2026
New Content
Added custom weather & ambient visuals to the Sulfur Cave.
Added a Rune Block Particles toggle to the settings menu
Added an Armor Particles toggle to the settings menu
Added a Seers Relic display type setting so information can be shown in chat or the action bar.
Added a setting to reduce command block output message spam.
Slightly increased how often drastic cave weather changes can happen by default.
Gameplay Improvements
Reduced custom zombie knockback resistance from 0.6 to 0.4, making them easier to knock back in combat.
Reduced the number of custom mobs that can spawn at once in many caves.
Increased the chance for special Treasure Chests to appear in cave structures.
Slightly reduced generation chance & density for material ores and salt.
Made Dwarven Soup easier to craft with a shapeless recipe.
Prevented Rune Blocks from dropping when mined with Silk Touch.
Removed spear equipment from zombie variants.
Moved some cover blocks into the Nature inventory category.
The Seers Relic output can now be displayed in the chat, which is the new default.
Timberfungus can now be placed on the sides of any full block, instead of only logs and wood.
Weblurker now despawns correctly when being killed.
Throwables will now fly as intended.
Mini-Boss Balancing
Increased Specter health from 180 to 280 and attack damage from 11 to 18.
Increased Lava Widow health from 180 to 380 and attack damage from 11 to 18.
Increased Bone Spider health from 180 to 280 and attack damage from 11 to 18.
Ancient Serpent Balancing
The Ancient Serpent is now a proper endgame challenge. Bring upgraded Eternal Caves gear, enchantments, and gemstone abilities if you want to walk away victorious. We underestimated you all last time, so good luck now!
Increased health from 1000 to 3500.
Increased melee attack damage from 18 to 48 and projectile damage from 18 to 54.
Increased explosive attack power from 3 to 7.
Increased airstrike damage from 15 to 39 and knockback attack damage from 10 to 27.
Increased death XP reward range from 30-80 to 50-100.
Visual Improvements
Reworked Flare visuals so thrown flares are easier to read in dark caves.
Reduced material block glow in Vibrant Visuals so bright blocks are less overpowering.
Updated armor particles and improved their performance, especially for Vibrant Visuals.
Improved ambient particle performance, especially for but not limited to Vibrant Visuals graphics, in Amethyst, Shrooms, Lava Lakes, and Forest Cave environments.
Repositioned Guide Book for better readability on smaller screens.
Copper Torches and Copper Lanterns now emit dynamic light.
Fixed block UV mapping issues that caused visual glitches in Vibrant Visuals. No scuffed blocks anymore!
Compatibility and Fixes
Added compatibility improvements for Oh The Biomes You'll Go, AdventureCraft, and Weapons & Tools.
Improved cave generation to prevent ores and other blocks from other add-ons from floating mid-air in our caves.
Fixed an issue related to material effects that caused wood to burn even when no material is equipped that could cause this.
The Verdite Ingot material effect now supports custom cave crops.
Improved vanilla cave detection so the add-on can more reliably identify which cave area a player is in, which also prevents cave visuals from appearing above ground in houses and similar locations.
Improved tool compatibility with Actions & Stuff.
Fixed Glider behavior in water and improved gliding overall.
Fixed mushroom variants not updating correctly when their state changes.
Emerald gemstone combat rewards are more reliable, including when defeating Blazes, and no longer apply to bosses.
Fixed Sphalerite gemstone effects so they trigger more reliably.
Fixed animated texture display issues that caused issues on Lava, Magma, Sculk and other various vanilla blocks in the newest version when playing with Vibrant Visuals.
Fixed flowing water replacement issues caused by dynamic lights.
Fixed an issue where dynamic lights and lanterns could break nearby crops or turn paths into dirt.
Light blocks no longer cause fences and similar blocks to incorrectly attach to them.
Fixed Ashen Door sometimes disappearing unexpectedly.
The Seers Relic now deactivates automatically when entering spectator mode.
Fixed plants with collision box out of block bounds.
Fixed invisible blocks that could appear when playing alongside Eternal End.
Fixed biome mob variants turning invisible when playing alongside packs such as Actions & Stuff, Prizma Visuals, or RealismCraft.
Fixed an issue where blocks around the player could ignite upon joining a world, caused by Gemstone System effects activating for one tick on join.
Fixed a bug where breaking stacked plants would not return the correct number of items.
Improved item sorting across inventory menus and subcategories.
Fixed deaths related to digging straight down 👀
Localization
Added localization support for German, Spanish, Mexican Spanish, Canadian French, French, Italian, Japanese, Korean, Brazilian Portuguese, Russian, Thai, and Chinese.
Refined existing translations and cleaned up translation text across supported languages.
Note: Additional languages are mainly automatically translated to make Eternal Caves more welcoming to players around the world, even if some wording may not be perfect. English remains the main language and is maintained by hand.
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