Final Fantasy VI (SNES) - Yeti’s Cave - Tonberries

A treasure chest inside the Yeti’s Cave contains the Minerva Bustier, but opening it will trigger an ambush with a trio of Tonberries. As time passes, the Tonberries will steadily come closer to your team, so you need to take them out quick. Once they get close enough, they will draw their knives to attack your team before going back in line for the battle. They are highly evasive and tend to counter your attacks by using the holy spell. After you defeat them, continue to explore the cave.