Thunder Dragon is an enemy in Final Fantasy IV: The After Years. It follows a strict pattern of Attack → Lightning, and then loop this pattern. To prevent as much damage as possible, the player needs to defeat it before it takes its second turn in the battle. It is recommended to inflict Slow or Stop on it if the party is underleveled, or use items that do so if there are no Mages present. Bringing equipment with resistance to Lightning-elemental attacks is also helpful, as the dragon's main means of offense is the powerful Lightning ability, which damages the entire party for a significant amount of HP.
[view·edit·purge]Thunder is the sound caused by lightning. Depending on the distance and nature of the lightning, thunder can range from a sharp, loud crack to a long, low rumble (brontide).
[view·edit·purge]A dragon is a legendary creature, typically with serpentine or reptilian traits, which is featured in the myths of many cultures.