This for now adds 5 Rare structures in the game! Theres : Creeper,zombie,spider and skeleton! And if your lucky you can get all of them in 1!!! Called the all structure.
And if you press U when your in creative. you will get the Spawn Menu! To spawn the structures!
For 1.14.4 1.15.2 1.16.4! I hope you enjoy this mod I have made. Request More Types too btw.