Laboratory of Lord Vyemm. At the start of KoS expansion this zone used to drop Relic armor off of every trash mob. Relic armor is no-trade peices that can be turned into class specific items with the correct stones. The stones are very common, and can usually drop off of any mob in KoS. Relic armor is a good upgrade from high tier 6 fabled and decent armor in KoS. The Breastplate and Legs are the special peices because they usually have affects on them that can reduce the casting time, or reuse on a certain skill. The helm for every priest but the Defiler has FT8 and same for the casters.
As of late though relic drops are more rare because there were too easy to obtain. And for some reason thats a No-no at SoE headquarters. Relic armor is very nice to have though.