You killed the ender dragon and now you don't know what to do with the egg?
How about using it to manipulate time?
Use:[]
Place the Time Manipulator on the overworld.
Upon right clicking it with a Infused Gem it will shift time!
Right clicking with a Day Infused Gem will cause the time to go backards until it's day time.
Right clicking with a Night Infused Gem will cause the time to go forward until it's night time.
Recipe:[]
Tired of time manipulating? Get your dragon egg back:
