Hi, recently i visited couple servers who run sky block maps. I noticed a mod there and don't know the name of it or how they did that on the servers and i am interested. To explain it, you use the command /is and can create an island, then you have the command /c what opens something like an inventory and you have different items in there what are actually not items, they are challenges and in the item text is written what you have to do. I bet someone knows what i am talking about and can help me out here, thanks so much.
I attached a picture of the challenges "inventory"