Ancient Chess Soul

The Ancient Chess Soul is a boss of varying levels.
==Where is it found?==
To find the Ancient Chess Soul, one must enter the Chess Challenge.
After deafting 200 Stones/Chessmen, the Ancient Chess Soul will appear.
It is the final and only boss in the Chess Challenge.
==What can it drop?==
Lv 1 Baby Pet Scroll
Medicines (eg. Lv 3 Air Powder)
Appraisal Scroll
Lv 1 Gem