Gungnir (グングニル, Gunguniru?) is a recurring ability in the Final Fantasy series. It is often a signature attack of Odin, used in some games instead of Zantetsuken when Zantetsuken would not be able to kill enemies outright, and hits enemies for high damage rather than inflicting Instant Death like Zantetsuken.
Gungnir will be used by Odin when summoned against an enemy immune to Zantetsuken. Gungnir attacks one enemy for heavy non-elemental damage.
Gungnir is used by Odin if summoned against a group of enemies and Zantetsuken is calculated to not work either due to immunity or the attack missing. Gungnir attacks one enemy for non-elemental damage equal to 4.875x base magic damage.
While the attack is still called Zantetsuken, Odin will use Gungnir to attack enemies instead of Zantetsuken if Garnet has the Odin's Sword ability equipped. The power of the attack is 145, minus one for the total number of Ore in the player's inventory.