Tower of the Unknowns Mystery Cache

Upon completion of my quest to the Castle of the Ancients I did find instructions to uncover the Tower of the Unknowns. However, upon arriving I discovered an odd assortment of pixie-like fairy creatures. In deference to their privacy, I am not writing out the full details of this quest. However, those who have found the Castle of the Ancients will be able to reach this spot.

Do not attempt to access the location which I have marked on my map. While there do indeed seem to be structures there, they seem most unwelcoming and inhospitable.

The pixies muttered something about the "Incantation of the bonus cache" ... or perhaps it was a curse? I do not know the meanings of these mystical terms and shall not attempt to interpret them.

Introducing the Order of the Geo, Explorers of the Realm, Purveyors of Mystical Satellite Wizardry, and Discoverers of Hidden Tupperware Feel free to note in your log if you do not wish to be included in this august group.
1. BristowCacher, Sir Cacher of Bristow	2. Gaiter Man, Ye Gaiter of Man	2. HD_JP, Honorable Duke & Journeyman Prince	4. Serrabou, Ye Rooster of Dork
5. mobywv, Guardian of the Underground	5. GeoBeau, Sir Geo of Beau	5. hooclass2002, Ye Trailmaker (Followers of thine Arrow)	5. schwandt, Rider of the Long Trail
#002,#006,#600		#800
5. saberspark77, Mapper of the Heavens	5.	11.	12.
Seekers with 10,000 finds or more shall be entitled to a crown upon their coat of arms.