How do you get the ultima weapons on FF3 DS

After defeating doga and unei (sorry if it is a spoiler) go straight to the tower in the middle of the crystal tower click on the door and you will be in forbidden land eureka you can get The moonring blade Elders staff ragnarok (demon blade and some ninja blade (only go for first 3 , get the ninja blade at like lv 65-75 kunoichi attacks 3 times) You can also get Excalibur (only wield by knights) easiest out of all 5 bosses (General) use luneth (dark knight) Refia (sage) Arc (dragoon) Ingus (summoner) make sure ingus have (leviath - to summon leviathan Bahamur - to summon bahamut ) go through the portal in the middle of ragnarok and the elder staff