No entry in Monster bestiary.
In this boss battle you will automatically lose. There is no escape from the "!!!" spell that he will use.
These encounters are entirely optional, and not recommended.
When the Malice Meter peaks and is in the red, there is a chance of randomly encountering Fox Face in the next battle. It's a one-on-one battle with him and Yuri, with the other party members not present.
Fox Face will use "SP Lowering", and "!!!", in addition to his regular, rather strong normal attack.
Should Fox Face be defeated, he will drop five of each soul type - fire, water, wind, earth, light and dark. However, if the Malice Meter is not cleared, he can return again in the next random encounter.
Fox Face will use "SP Lowering" to prevent you from using a fusion. But you should have enough SP to allow you to fuse with a monster.
Have Yuri fuse with any fusion monster that you had selected before the incidents at Kuihai Tower.
Heaven's Fiend if you had him in your slot. Keep pounding him with special skills for this is the quickest way to defeat him which you want since he will still use the dreaded "!!!" attack.
In 4 or 5 attacks he will go down, do not forget to heal when necessary because he has high attack and that "!!!" can be deadly.