Neverwinter is making some changes to the leveling curve between 60 and 70. A dev blog released this week says that the team has removed the 50 percent HP buff that was previously found on level 61 to 70 mobs. A slight difficulty increase was desired, Perfect World says, but those numbers were “definitely too high.”
Mob damage has also been reduced, and players will now gain increased XP for missions in the Elemental Evil zones, which should speed you on your way to 70. These changes are coming “soon” to PC and in the next update on Xbox One.
Source: Dev blog
