Crystal Dragon is an enemy from Final Fantasy IV: The After Years. The Crystal Dragon counters all attacks that hit it with the Stop spell, so it's advised to defeat it before everyone is inflicted with Stop. The Crystal Dragon will normally follow a pattern of four regular attacks, followed by Maelstrom to reduce the party's HP to single digits, and then repeats the pattern. It is therefore vital to defeat it before it takes its 5th turn in the battle.