Aura Seal

Aura Seal is a debuff in Xenoblade Chronicles. It prevents the victim from using any arts that are s, in addition to neutralizing any s the foe might possess for the duration. It does not naturally erase any active auras, though the only art that inflicts Aura Seal is Monado Purge, which does also clear auras. If an aura art is in progress when Aura Seal is applied, it runs to completion but the aura is not activated.

Aura Seal is a situational debuff. It is useless against enemies that do not possess auras or spikes, but against those that do, it can be the one thing that saves the battle against them.

It is not clear whether sealed enemies are capable of using aura arts when sealed, and they choose not to as they would be wasted, or they are mechanically unable to use them. As there are no enemies that can apply the debuff on the party, there is no way to be sure.