Overwhelm is a Technique for Ignis. It costs 18 AP to learn and is available on the Ascension after he learns Regroup. It costs 2 tech bar segments to use. Overwhelm is one of the most powerful attacks the player can pull off when they have a full party.
When used, Ignis orders the party to focus attacks on one enemy. Noctis retains normal attacks with his equipped weapon (will do nothing with magic or the Ring of the Lucii). Allies also attack with Deathblows if they're unlocked, and will use secondary weapons, if equipped. Overwhelm grants Tenacious on the party, and Critical on Noctis, or the whole party for the critical version (the technique name appears in yellow rather than in green when initiated). It is less effective against highly mobile or hard-to-reach targets, such as flying targets and it ends prematurely if the target perishes.
Ignis can't use it in Chapters 10–13.
Combining Overwhelm with Noctis's Bow of the Clever, used to give the crossbow an amazing fire-rate and damage, but the player was in danger of entering Danger state as it was easy to drain all of Noctis's health this way. The bow's fast firing rate during Overwhelm was nerfed in patch 1.16.