To get this update, you have to opt in inside your library: Necesse -> Properties -> Betas -> Select 0.21.x in dropdown. It has been over a month since the last update, which means this is a relatively big one. I have updated level generation with new tools that can generate more dynamic and interesting structures. Using this it is now possible to find rivers that flow through islands, a new mini biome found in the caves and a big new structure found in the new deep desert caves. Cave spider nests and cave lakes now also use this, which means they will be more smooth and natural.
The desert now has a custom deep cave system. Complete with a new ore, a couple of new enemies and a bunch of new items found in it. The boss introduced in the last update has been moved to this new cave, where it can be spawned by interacting with an object.
Building has gotten a few new additions, including a couple of new fences and new columns. A few textures have also been updated like stone path which now also shows a bridge when placed above water tiles. Lastly, there are a lot of smaller balance tweaks, a new animation to dropped items and debris, the occasional texture update and more. See the full changelog below

Changelog

Additions:

Added small rivers that can spawn on islands. Added ability to automatically track new quests. Added Traveler Cloak trinket, crafted from Mobility Cloak. Added Explorer Cloak trinket, crafted from Traveler Cloak. Added the ability to scroll on items to quick move one item between inventories. Added height and bounce animation to dropped items. Added small drop animation to death particles. Added ability to filter which items settlers should move. Added stone fence and gates. Added iron fence and gates. Added wood and 3 different stone columns. Added crypt mini biomes to forest/plains caves. Added Fuzzy Dice trinket, obtained from surface ruins. Added Lucky Cape trinket, crafted using Fuzzy Dice and Noble Horseshoe. Added deep desert caves. Added Ancient Fossil ore and bars, found in deep desert caves. Added Ancient Fossil armor set. Added Ancient Dredging Staff weapon. Added Sandworm mob. Added Desert Crawler mob. Added move sound to Grit and Sage. Added Skeleton Staff weapon, dropped from Grit and Sage. Added Scrying Mirror trinket, found in deep desert cave chests. Added Digging Claw trinket, found in deep desert cave chests. Added Antique Rifle weapon, found in deep desert cave chests.

Changes/misc:

Updated mini biome generation, will now have less hard edges. Increased the amount of quartz in desert biomes. Updated island tree generation to be more natural with open areas. Made holding down to craft/buy faster. Items will now no longer sink completely in water. Reduced giant cave spider health and drops. Reduced damage of Swamp Guardian. Chests in the same dungeon, pirate village, caves etc. will now have more varied loot. Updated Mobility Cloak Texture. Reduced deep cave mobs health and aggro range. Reduced Deep Cave Spirit spawn rate. Hostile mobs will now also target settlers. Settlers will now run to their home if they cannot defend themselves. Updated stone path texture and added bridge when placed above water. Updated village generation presets slightly. Decreased drop chance of bait from grass. Increased Razor Blade damage slightly. Reworked mob spawn logic, allowing much more control over spawns. Blood Bolt will now only be found in new cave crypt mini biome. Noble Horseshoe is now found in cave chests. Increased damage of weapons dropped from Reaper and up. Sage and Grit is now summoned in deep desert caves. Crates will now always drop biome specific loot. Reduced loot from crates slightly, since it now spawns way more places. Reduced boss item drops slightly. Increased Ostrich mount speed slightly. Reduced recipe cost of basic arrows and bullets.

Fixes:

Fixed possible crash when joining multiplayer server. Fixed possible fatal Java crash when music changes. Fixed potential issue with fishing reel phase. Fixed possible crash when killing Pirate Captain with a projectile. Fixed some items getting unlocked when sorting. Fixed homing projectiles sometimes not homing in on distant targets. Fixed possible crash when opening a crafting station. And other smaller changes and fixes.