The general idea of this collection is to add even more depth and breadth to the game in a way that doesn’t seem entirely out of place. This collection should work as intended once Expanded Stellaris Traditions and Expanded Stellaris Ascension Perks are officially updated. In the meantime, if you wish to substitute in the unofficial versions, they do appear to work even if there are still a few bugs.

Major additions include:
-Expanded Fallen Empires, including new player-accessible mechanics and tech.
-Expanded megastructure options and types.
-Expanded diplomacy, espionage, and galactic community options.
-Expanded Machine and Hive Mind possibilities.
-Many additional Ascension Perks and Traditions.
-Many more Events.
-Many more Origins.
-Many more Archeological sites.
-Many more civics and government types.
-Expanded technology options.
-Additional Starbase options.
-Additional planetary features.
-Additional planet types.
-Additional Crises (with the possibility of getting all of them)
-UI Enhancements
-Skybox Enhancements
-Expanded galaxy generation.
-Expanded namelists.

Ethics and trait expansions have not been included in this collection.

Keep in mind that this collection was not assembled with low-powered computers in mind. I can’t speak for the performance impact of additional scripts, but I can say that lots of stars and lots of species will do what they normally do.

Load Order Notes:

• Ariphaos Patch First
  
• Expanded Stellaris Traditions Second.
  
• Expanded Stellaris Ascension Perks Third.
  
• Ad Astra! should go after Gulli's Planet Modifiers
  
• All compatibility patches and the Extra Defines for Ancient Cache should go before ~Acquisition of Technology.
  
• ~Acquisition of Technology should go immediately before Merger of Rules.
  
• Merger of Rules should be immediately before the UI mods.
  
• All the UI mods and their compatibility patches should go in at the end.

You should probably use Irony Mod Manager for this, even with the patches.