The Glyphed Stone is an old Adventurer's Tome in Lost Ark. The Tortoyk Continent is usually the only place you can find it. Here, it sometimes drops randomly.
Where is the Glyphed Stone in Lost Ark?
Glyphed Stones are more likely to drop when fighting larger monsters in dungeons. Going straight for the special monsters is the best way to increase your chances of finding the Glyphed Stone.
These collection items are not earned in a set; you have to fight monsters and hope you get lucky with a random drop. A Glyphed Stone is a rock with a glowing glyph on it, similar to stereotypical Runestones from every other game.
Related: How to get Stinky Scale in Lost Ark?
Before placing it in your Adventurer's Tome, you should go to a secluded, safe place. In most cases, Mokoko Village is the best option.
Open your Inventory by pressing the I key and then right-click on the Glyphed Stone. You will receive a notification that the Glyphed Stone Collection has been added to the Adventurer's Tome.