First Battle of the Underworld

The Battle of the Underworld is an armed engagement between the Dwarven Kingdom and Baron in Golbez's quest to obtain the four Dark Crystals in Final Fantasy IV. Although presenting the toughest resistance Baron's Red Wings have faced so far, the dwarves lose the crystals to Golbez. Nevertheless, their tank army remains intact and undefeated and will later play an important role in the Battle of the Giant of Babil.

Battle
By the time Cecil's party arrives in the Underworld, Golbez has obtained two of the crystals. The party's airship, the Enterprise, is caught in the crossfire between the warring parties and makes an emergency landing near the Dwarven Castle where King Giott of the dwarves tells the party the tanks have repelled the Red Wings and that the third crystal is safely stored in the castle's Crystal Room. Golbez sneaks into the Crystal Room and steals the crystal before escaping after a face-off with Rydia's summons.

Giott takes the bad news lightly and divulges the last crystal is in the Sealed Cave which Golbez cannot open. He sees this as a good time to reclaim the crystals, and orders his tanks to create a diversion so Cecil's party can enter the Tower of Babil. However, the plan fails.

Giott fears Golbez might succeed in breaking into the Sealed Cave and take the last crystal, and orders the cave opened for Cecil's party. Golbez seizes the chance to steal the crystal before retreating to the Overworld.