From July 2nd through July 30th, Tree of Savior players of level 50+ are invited to head to the Reset Helper. Doing so will reset all of a player's abilities to allow them to try out new class combinations by acquiring a Stat Reset Potion and Class Change Vouchers. This can be done once per day for the duration of the event.
Try out a variety of class combinations to celebrate the arrival of new gear and the new unique raid! Enjoy your new classes and Start Anew!
Tree of Savior classes and abilities have been heavily retooled since launch, so this seems like a great way to check out all of the new ways to play.
Read the details on the Tree of Savior site.