Masteria Expansions, Names and the proof for each

It seems that the Key to the Inner Sanctum is needed to enter Crimsonwood Keep.

 Spoiler

8223.1.0 You have done it! As I promised, here is the key to the Inner Sanctum. 1727851
8223.1.yes.0 Lightening Field? The Grandmasters would never shield the entry to their Council Hall in such an offensive manner! This Keystone opens the mechanical locks of Inner Sanctum gates, but this unholy energy field you describe is another matter.