Mimic

The Mimic is an optional encounter in the Treasure Cave location of the game. She is also the first monster in the game who can defeat Luka in one attack, which can be done if Luka attacks the treasure chest of Mimic while it is closed. She is one of the more notably harder battles in the game, requiring SP conservation and patience if you wish to defeat her.

There is no reward, unlike other monsters, for skipping the fight with Mimic. However, Luka will gain a level if she is defeated, making the upcoming battle with Nanabi a little easier. Alice does chastize Luka for opening the chest in the first place though.