Withness of Stone

Exploration Stage: Moon Gate
From: Monk
Description: If the legend is true and the hero of the imperial line did defeat the monster, we'll find a guarding tablet preventing the banished monster's return. Perhaps the tablet had collapsed, and this resulted in its appearance? Is there a tablet nearby?
Completed: You found a guarding tablet: it means that the princesses' distant ancestor defeated the monster and it shouldn't have returned. But the beast is here. What kind of power helped it?