From the Official Bullroarer Beta 1 Release Notes for U18:

For characters level 100 and higher, the Featured Instance can be accessed through the Instance Finder Specific Tab and will award extra rewards once daily (per character) for completing the listed instance. The Featured Instance will change weekly at 12am Monday.

It appears as though Turbine has finally found a way to effectively recycle some older content by “featuring” an instance for one week at a time. During the time that the instance is featured the rewards are better than normal. Thus far during the U18 Bullroarer Beta we have seen Crystals of Remembrance, Star-lit Crystals, etc. dropping at a decent rate. In addition, there is an Amethyst Box of Spoils awarded to each person in the group. Inside this box there could be essence recipes, featured armour, long-lost coins, etc.

Featured Beorning Set Featured Burglar Set Featured Captain Set Featured Champion Set Featured Guardian Set Featured Hunter Set Lore-master Featured Set Minstrel Featured Set Featured Runekeeper Set Featured Warden Set