Elytra

The Elytra is well known as a vanilla game item. Despite this in recent times Hausemaster has disabled its use. He did this for an understandable reason though when flying with the Elytra your creating a large amount of new chunks which resulted in the server slowing down and with lag machinates and many players creating new chunks can even crash the server. It looks like the that the Elytra from now on will be unusable unless someone finds a fix to the problem.