When Litrasaurus was with his family many millions of years ago there were many different types of Ancient Trees - but this particular ancient tree bears wonderful fruits of knowledge, Fructus Cognito. Only Litrasaurus is allowed to pick the fruits from this ancient and magical tree and these fruits of knowledge can only be used for his quest and to help his friends in their adventures to achieve that aim. The power of these fruits is indeed knowledge, whether used to shield his helpers from trouble or to advise them on the best course of action, but may never be used for selfish or cruel purposes.
The tree of knowledge was a true and loyal ancient friend of Litrasaurus. He protected the cave from strangers by obscuring it even though the door into it was invisible.