Quote Originally Posted by CHRISTMAS ANSWERED IT TOO, LONG LONG TIME AGO, BUT ANYONE CAN HAVE THEIR ANSWER.

INTERVIGILIUM (Sleep) - The sleep magic
VIVIDARIUM (Garden) - The Garden of SeeD
VIATOR (Messenger) - Diablo's dark messenger attack

Big Picture: In A Garden Sleeps A Messenger:

Diablos sleeps inside the magical lamp which is given in Balamb garden,


Anyone can have their interpretatons of their own like future Esthar having his but since there is nothing much to verify it, I can't say much about those pictures only that it make the boss appear that's all.