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Gillian's Diary is a two-part tome in Act I of Diablo III. Both parts are needed to complete the achievement A Quick Study. They or a number of other books can be found in Old Keepsake Boxes next to buildings or the broken bridge on Old Tristram Road, or in The Old Ruins.

The diary was written by Gillian, the tavern barmaid in Tristram, apparently shortly after the The Darkening of Tristram and the first defeat of Diablo under the town.

They read as follows:

Part 1
Ogden and his wife have offered to let me and Grandmother continue to stay with them. I think we will now that the troubles are over.
I am still tormented by horrific nightmares. I keep hoping they will fade, but they seem to be getting stronger.
Gillian
Part 2
To think I was once afraid of Adria. She is going to take me to Caldeum! I never thought to see it with my own eyes...
Thought it saddens me to leave Ogden and his wife, Adria assures me that she will find a cure for my nightmares.
Gillian

Collection[]

Main article: Old Keepsake Box

This diary is one of many different lore books that can be contained in Old Keepsake Boxes, which appear only once or twice per session in an under-traveled area of the game world. Because of this, the chance is quite low to "naturally" find the second part of the diary in a replay of the campaign in a new season - it usually must be specifically hunted (in either game mode).

Cain's Old Journal has a similar issue, and is also required for the achievement A Quick Study.

Story connections[]

The second part of this lore book hints at Gillian's future with Adria, who at the time was pregnant with Leah. These events are described further on in The Order, a novel released the same day as Diablo III which includes more detail on Leah's childhood.