Rune Slates are Book-like items found on the Nautiloid and in the Mind Flayer Colony. When "read", the Narrator describes the mental images they impart.
Holding this tablet causes a flash of inscrutable images to appear before the eyes before vanishing, leaving a mild headache in their place.
Properties
Miscellaneous Items
Rarity: Common
Weight: 0.2 kg / 0.4 lb
Price: 1 gp
Where to find
Found on the east side of the Nursery Room, northeast in the Brain Room (one called 'Eldritch Tablet') and east side of the room with Shadowheart's pod (an 'Illithid Manuscript') aboard the Nautiloid (Prologue). In the Mind Flayer Colony there are two more tablets on the table in the small cubbyhole sideways from the Necrotic Laboratory. However, to read these the player needs to pass 
DC 14 Arcana check.
Text
- *Visions project into your mind. A nautiloid, hurtling through the planes, resplendent with psionic energy.*
- *A schematic of a nautiloid flashes into your mind. Nerves, sinews, as much living being as ship.*
- *A feeling penetrates your mind. An anomaly. One like ourselves, unconnected from the whole. Caution.
- *Worlds beyond worlds flash before your eyes, empires of a grand design, traversed by ships just like this.*
- *Faint images appear in your mind: a brain, a githyanki warrior, and centuries of darkness…*