From Guild Wars 2 Wiki
Double-click to consume.
Double-click to open a rift to the Mists.
— In-game description
- Sends the player into the currently active Mists Rift. Warning: If you have already completed the current Mists Rift, you will be immediately ejected back into Tyria. This still consumes the Riftstone.
- If you've been rejected from a rift, you will need to wait until the current instance has closed before you will be accepted. Often you are better off saving your Riftstone and waiting for the next rift event.
- The Branded Riftstone is best used for obtaining the last few items for the Helpful Hero achievement. They are particularly helpful for forcing an instance to open during the appropriate time window if the rift events get out of sync.
- Once Helpful Hero has been completed, the stones are much less useful, serving only as a means to bypass the rift event for entry.
- Cannot be used in WvW.