Soul of Thamasa

The Soul of Thamasa (ソウルオブサマサ, Souru Obu Samasa) is a recurring accessory in the Final Fantasy series. It affects the character's ability to cast magic. It is named for the town of Thamasa in Final Fantasy VI.

Final Fantasy VI
The Gem Box in the original English version was renamed to the Soul of Thamasa in the Game Boy Advance version. It grants the wielder the ability of Dualcast. It originally could only be acquired at the top of the Cultists' Tower, but in the Advance remake, additional others can be stolen from Glutturn (Elixir). Thamasa is a town in this game, founded by disgraced mages and populated by their descendants, and one of the only places left in the world where magic is still practiced. The item's name is likely a reference to this town.

Crisis Core -Final Fantasy VII-
The Soul of Thamasa is an accessory that gives No MP Cost that allows Zack to cast spells without consuming MP. It can be found during missions 9-4-4 and 9-6-5.

Final Fantasy VIII
The Soul of Thamasa, mistranslated as Samantha Soul, is a Guardian Force Ability item that teaches the "SumMag+40%" ability to any Guardian Force. 3 can be acquired through refining Quistis's card, while others can be stolen from Adel, or by refining 50 Energy Crystals into 1 Samantha Soul. 20 Samantha Souls can then be refined into 1 Elem-Atk or 60 Triples.

Final Fantasy X-2
The Soul of Thamasa is an accessory that doubles MP consumption of the wielder for all spells, but strengthens the effects of said spells. They can be bribed from an Oversoul Detonator and Volcano, stolen from Volcano, or won from Ixion.

Final Fantasy XII
The Soul of Thamasa is a loot stolen by Ishteens and dropped by Oversouls, and is a reward from the Deathscythe hunt. It is one of the loot items needed to buy High Arcana from the Bazaar.

Dissidia Final Fantasy
The Soul of Thamasa is an accessory that raises magic damage by 20%, collision damage by 10%, and Chase Bravery damage by 10%. In her EX Mode, Terra's "Chainspell" ability is described as "embracing the spirit of a magus," referring to the Soul of Thamasa from Final Fantasy VI that gave the Dualcast skill.

Final Fantasy: The 4 Heroes of Lightedit this page
The Soul of Thamasa is an accessory that raises magic attack by 10% and intellect by +5 points. It is acquired as treasure earlier in the game, and is later available at the item shops in Urbeth.