Website and data research by 101Leafy.
True Highest Map
真ハイエスマップ · Map
Map of the depths of Highest Peak...
Price 10Sells for 5
No shop sells it, no chest holds it, no enemy drops it, and 101Leafy has not found a story event that gives it.
Shin Megami Tensei Wiki by 101LeafyAll Demons Index