Druid Summoner

The Druid Summoner is a large human wearing a magician's hat and cloak. It was the boss of the sixth floor in the Seventh Event.

Appearance
Depending on the source the Druid Summoner fights either Maple and Sally (Light Novel) or the Congregation of the Holy Swords (Anime). In either case it's taken down after a long fight and the members of the party learn the skill [Crystalize].