Today, the guild that I am in did a T3 bounty and got Mayana. She spawned on the top left corner of the map. However, her level was seriously out of sync for the scaling that was done to our levels. We were at 57 DS level, while she was a whopping level 65. It took us awhile to kill her but we had several losses, as well as running out of time. Just putting this out there for ANet so they can fix it.
