How do you get the oversoul to spawn in final fantasy 12?

ok so ive been searching high and low for the tourensol loot and i have 3 high arcanas to collect left i already have the one from montblanc i have 3 feystones and over 30 arcanas and no soul of themesa so its either i get it from the oversoul or if u have a better to steal or drop high arcanas i tried stealling it from esper adramellech and esper zalera but i cud only steal once from them and its not a high arcana so how do i get it and can i steal more than once from an esper


plz help





p.s i already got a high arcana from the soul of themsa obtaind from the deathscythe hunt|||It's a little difficult if you're at lower levels. The Nihopaloa comes in really handy here. Go to the Necrohol of Nabudis. Once you kill 18 enemies(Baknamies and Elvorets, some Golems) an Oversoul will spawn. Now, kill 15 enemies and an Oversoul will spawn. This happens with 10, 5, 2, and 1 enemies, respectfully. When you have spawned the 6th Oversoul, the rare enemy Helvinek will appear. Helvinek drops Grand Armor(an extremely rare drop, but the only way to get the best heavy armor). You can only spawn 6 Oversouls per trip to the Necrohol. You will have to leave, exit two screens and then return to spawn more Oversouls. Be sure when you enter the Necrohol that you are equipped with either Black Masks or Demon Shields to protect from Dark Magic.


You can also steal the Soul of Thomasa from the rare monster Ishteen in the Barheim passage.