Skulk Dimensions gives you, New Dimensions, Tools, Armor, and more. Explore the skulk Dimensions, and activate the portal in a deep dark place.
It won't affect the player at all unless they open the portal to the dimension. By the way I recommend downloading my other mods. This is also an addon to my Overgown And Void Dimensions Mod, But don't worry it will have updates and I'm planning on making it my 2nd biggest mod.
Story
You go mining you find this weird place deep deep below surrounded by dark stone and this blue and black block. you wander deeper and you make a noise and something appears out of the ground. You don't have enough time to look at it. You run away and find this portal looking thing on top of what looks like the shape of the monster. You light it with a Flint And Steel and it works you jump in and your in and even darker creepier place.