Gate of Memoirs/Demon Leftovers

A demonic "shadow" found in one of Ishgria's regions. Why would demons create such a thing? And what is the purpose of these "shadows"?
==Demon Leftovers==
*War Demon's Power
*Broken Seal
*Guile Demon's Power
*Bewildering Shadow
*Sight Demon's Power
*Vanishing Seal
*He Who Obeys
*Foolish Shadow
*Nature Demon's Power
*Demon's Last Words
*Calamity Demon's Power
*Mirfah's Request
*Mirfah's Vision
*Sealing and Guiding
*Overcoming Doubts
*Paris's Gratitude
*Seeking Strength
*Barion's True Power
*Karl, the Summoner
*The Hidden Seal
*The Forgotten One