Thoron (トローン Torōn, also known as Tron in some fan translations) is a powerful Thunder Magic spell in the Fire Emblem Series. When cast, this spell will momentarily encase the selected enemy target within an orb of electricity, whereupon masses of electricity will converge into the orb and strike him/her. This spell essentially serves as a class buster against Dragon tribe Laguz in the Tellius Series, where its high Might and Hit Rate allows it user to inflict copious amounts of damage upon them with the utmost precision.
Although this tome is slightly more expensive than its counterparts Bolganone and Tornado in terms of its Cost Per Use, its Might is considerably higher than both variants.
In Fire Emblem: Fates, Thoron is the personal tome of the avatar from Fire Emblem: Awakening; Robin. It can only be obtained by scanning the Robin amiibo and it cannot be removed from his inventory. However, Thoron replicas are available whenever Robin is manning the armory in My Castle, though they are not as powerful as the original.
Thoron is a special move of Robin in Super Smash Bros. for Nintendo 3DS and Wii U. It is the final form of Robin's Standard B move which takes 5 seconds to charge. Thoron appears exactly like it does in Awakening, manifesting as an extremely quick, horizontal bolt of lightning. It can pierce through multiple targets.