the modpack adds bosses dimensions and guns 

The most immersive Minecraft FPS experience

• Sophisticated shooting, maneuvering, and inspecting animations
• Well-designed gun craft system - Modify your guns with attachments, survival-friendly!
• Refined models and optimization go hand in hand - LOD optimization strategies
• Compatibility - Compatible with most shaders, play with confidence!
• Feel free to customize the guns' data via config and data JSON! （need Cloth Config）
• If you want - Create your GUN PACKS without any coding!

TaCZ was developed by reorganizing the original TaC development team devs, completely rewriting all the code, remaking the models and animations, and adding and modifying many features

Right now, this mod has four bosses.

• Night Lich, found in rare towers in cold biomes. Locate the towers by following soul stars.
• Obsidilith, which appears in rare structures in the end islands.
• Nether Gauntlet, which appears in rare structures in the nether. 
• Void Blossom, appears in rare caves at the bottom of the world. Void lilies will point the way.
• They can be accessed in creative via the /summon command.

• 🔷 What is Blue Skies?

  Blue Skies adds two dimensions called the Everbright and the Everdawn. It includes lots of new unique features, blocks, weapons, mobs and even massive dungeons! Each dimension has its own theme, with the Everbright being very bright, snowy and cold while the Everdawn is typically darker and warm. Each of these dimensions currently has two dungeons to explore, totaling up to 4 dungeons, with more planned on the way!

  ✔️ Getting Started

  I want to play! How do I install Blue Skies? To get started, make sure that you have downloaded the latest version of the mod and you are running at least the recommended version of Forge to your Minecraft client. Alternatively, You can also easily install Blue Skies using the new CurseForge launcher, if you don't have that installed already. Download it here: https://download.curseforge.com/. Then, you can click here to view a guide on how to install Blue Skies with CurseForge launcher.

  🔑 The Gatekeeper

  Find the Gatekeeper and trade a book in exchange for his journal. You can find the houses spawning in either plains, mountains, and most snowy biomes. The Gatekeeper has extensive knowledge on these dimensions and has written all about the blocks, mobs, and dungeons found within to help guide you on your journey. You can also trade for a Zeal Lighter that works on both the Everbright and Everdawn portal frames. Check around their home as they have an unlit portal frame somewhere. As you progress through the mod, other trades may become available, so it's worth checking his offers after reaching certain milestones.