Unstable: Citizen’s Library Books
Unstable: Citizen’s Library Books (54)
It seems the library of City Core had a unique method of preventing late returns. The books simply return themselves after a period of time. This mechanism still seems to be working despite the fact that the rest of the library has been destroyed.

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Stats
This is a Unstable artifact set containing 10 artifacts
The difficulty level for completing this set is Hard.
Source:
Storm Legion > City Core
These artifacts can be collected during Unstable Artifact zone events in City Core. During the event you will see the artifacts as Blue shinys on the floor. The best way to farm the rarer artifacts is by hunting the Squirrel Thief’s. You can find information about this in the Unstable Artifact guide.
This set can be found inside artifact caches, looted from minion missions, or rewarded from the daily/weekly gifts
Rewards:
The Basic Loot Chest: Coffer of Goods
The Reusable Item: Gorgeous Frog Carving
The Currency: A Planar Nut
Credits the Cheevo:
Unstable City Core
Artifacts in this set:
Holdings of the Noble Families
Empyrean Technology Explained
1001 Uses for Terrormaw Dung
Stained Glass: A Primer
Empyrean Water Management
Thorn Vines. Invasive Species or natural Evolution
History of the Public Market
The Royal Lineage
Hiking in the Holdings
Legend of the Karthans
Empyrean Technology Explained
1001 Uses for Terrormaw Dung
Stained Glass: A Primer
Empyrean Water Management
Thorn Vines. Invasive Species or natural Evolution
History of the Public Market
The Royal Lineage
Hiking in the Holdings
Legend of the Karthans
For a full list of collectible artifacts you can visit the Artifacts List.