Now, all that waits to be seen is just how Thanos actually uses the Reality Gem and the rest of the Infinity Stones, to enact his plan of rebalancing the universe.
With the ability to allow the users to control dark-forces, manipulate reality, and even revive the dead, the Reality Gem will be one of the more difficult Infinity Stones for Marvel and the Russo Brothers to fully explain/showcase on the big screen.
Meanwhile, one of the more exciting Infinity Stones to consider is the Reality Gem, which allows the user to alter reality however they see fit to and break the laws of reality and logic, if they so desire.
The Infinity Stones each represent a different kind of cosmic power that, when united, allow the user to do basically anything they can think of in the universe.