The blank observation is an item obtained by talking to Azzanadra about his mission after completion of the Heart of Stone and The Temple at Senntisten.

The first time players ask Azzanadra about his mission, this item will not be obtained, and he will state that he plans to visit JasKra. A few minutes later, the dialogue will have changed and he says that he has visited JasKra and has obtained the observation while there, and will then give it to the player, telling them to keep it safe.

At this time the item has no use in-game, but Mod Raven said that it may have a function in the future.[1]

Trivia

Before 12 January 2015 the blank observation could not be banked.

References