To complete the Adventurer's Tome, you must find a collectible item called Frost Spider Cocoon in Lost Ark. Monsters will drop the Forst Spider Cocoon collectible on the Shushire Continent (or other areas if you have already visited Shushire).
Where is the Fost Spider Cocoon in Shushire?
In Shushire's Lake Eternity area, there are lots of Coldsnap Spider monsters and their friends. A Frost Spider Cocoon is not to be confused with a Frost Spider Egg; it is simply a bunch of cocooned frozen spider eggs. This one is more likely to be found in colder areas, based on the description, which states it can be found in the Spider's lair.
Before adding it to your Lost Ark collection, you should take it to a secluded, safe area. The best place is Rigens Village, since it has no enemies and is the main village for Shushire. This is not the most extravagant city around, but it's the most prosperous in Shushire.
Open your Inventory by pressing the I key, then right-click on Frost Spider Cocoon. The Adventurer's Tome will notify you when the Frost Spider Cocoon Collection is added.
For more Lost Ark guides, check out How to get the Thick Parchment in Lost Ark or How to get Icewing in Lost Ark right here on Pro Game Guides.
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