a few secret blocks (3)
Note: Minify the command to avoid issues :)
Twilight Hydra Boss (No Mods)
Ur-Ghast No Mods
Jupiter (the "ghast" giant)
Celebrate With Commands For 1.9.x
go 1000mph with a walking stick
TnT
Get cool minecraft banners in ONE COMMAND NO MODS!
Herobrine's Flesh