Hi, we can add more spiders on the alien planets, the option should be in the advanced world settings, so that is a thing in Vanilla and make sure all encounters/NPCs are enabled in the world setting.

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About Mods :

NPC Mods usually replace the default encounters so you may not be able to mess with spiders and encounters options because they will be locked.

You may try this Mod but I strongly recommend to take time to read the item description, watch the videos and test in a copy of your save or a brand new world set creative mode.

-> It's important to know what the Mod do / know what we are doing before adding to our Favorite save.

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2596208372
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A lot use the Mods in the Modular Encounters Collection :
https://steamhost.cn/steamcommunity_com/workshop/filedetails/?id=888460730

Thx

My pleasure!


I will add
-> I always test one Mod at a time in a new created world set on creative mode, to test faster and to help pinpoint conflicting Mods not able to run with other Mods.