Great Druid
From AmtWiki
A reference to the 6.0 Rules of Play, when certain classes had names assigned to each level.
Druid:
1st Level: Druid
2nd Level: Druid of the Outer Circle
3rd Level: Druid of the Inner Circle
4th Level: Druid of the Center
5th Level: Arch Druid
6th Level: Great Druid