from recent patch notes.* Zone Events: Unmentored high-level characters may find that their damage is reduced against low-level colossi. Mentoring down to the level of the boss will allow you to deal normal damage.
So my toon is Level 52. The Zone-Event Mobs in Shimmersand/Stillmoor are Level 50 and green for me, but I do only damage in the range of 10-20 to them. This is not funny. And because of the Five-Level-Limit when I mentor down I'm Level 47 and it's not funny too -.-
Trion, when you change gameplaying rules you should also allow players between 51-60 to mentor down until one Level below actual Level, not 5. Because Leveling lasts longer from 50 to 60, and being punished for being Level 51+ is not funny. Did I mention, that it's not funny?