Final Fantasy VI/Edgar's sidequest

Final Fantasy VI -> Edgar's SideQuest/The Ancient Castle

You don't technically need Edgar for this sidequest since anyone can use Figaro castle now but since it occurs in relation to his home turf I decided to classify it like this. You'll probably want a high-level party for the tough enemies and the two semi-bosses you'll have to fight. First, head to Figaro castle. Just for reference Figaro castle is in the desert of the continent to the northwest by Kohligen, or else in the continent just to the southeast of that if you moved it. Move the castle from Kohligen to Figaro and you'll get an offer to stop along the way to investigate a stratum. Head right and go through one of the prisoner's cells to find yourself in a cave.

Do your usual routine of clearing the place out of chests. Keep in mind that the chest in the top right of the second room will have a tough monster in a box fight against a Master Pug for a graedus. Work your away around the second room to the top left to move into another area. When you reach the room with the stairs make sure to walk through the walls for two more chests, and go down the stairs to find yourself outside the Ancient Castle. Walk forward a bit to witness a cutscene about the war of the Magi.

Head through the little door on the right to get a punisher weapon, and head through the two alcoves on the left to get a tough monster in a box fight against the Katanasoul. It reflects magic attacks so use your best physical fighters to get through about 32000 HP. When you win, you'll get the offering, the best relic in the game. It allows you to attack four times. When paired with the genjiglove you get a total of eight attacks in one round.

Head through the castle doors and in through the next room to see Odin standing in the center of the hall. Talk to him and you'll receive the esper Odin. The esper teaches you meteor at a rate of x1. Later on when you get the crusader esper you'll be able to learn Meteor at x10. You'll soon have to option to turn Odin into Radin as well, so teach anyone that spell that you want, they'll be able to learn it later in any case. The left passageway takes you to the room above the fight with the Katanasoul which is empty of items. From the main hall, the left alcove on the right side of the throne takes you to a secret room with a blizzard orb, which gives Umaro a special attack, and a gold hairpin, which cuts MP use in half.

Head into the right passage from the main hall and pick up the glowing dot to get the Queen's diary. It'll tell of the queen's love for Odin, and if Terra is in your party she'll comment briefly on it. If you talk to the scholars in the Figaro library they'll tell they found an ancient text talking about a thousand year old city, with a line stating that "the queen stands and takes five steps..." Consequently, if you step five steps below the queen's throne on the right and hit A you'll trigger a staircase in the room to the right. Walk down the stairs to reach a large room with a statue resembling Celes at the end. Talk to the statue and it will transform the Odin esper into Raiden, which can now teach you Quick.

When you're ready, fight the blue dragon. It's weak against lightning, use your strongest magic and equip the offering/genji glove combo on your best fighter for some serious destructive potential. After that, you're finished with the sidequest, go back to Figaro castle, tell the man in charge to continue, then you'll probably want to tell him to head back so you can pick up your airship.

See sidequests list