Amnesia is an affliction which makes one forget one action that one means to take. Amnesia is not an affliction which can be fixed through curatives, rather it instantly clears up automatically after ones intended action has been suppressed.
Aside from a low-level damage attack, amnesia is the only combat-related ability that Artefact pets can be equipped with.
This affliction is different from the Battlerage attack which has a similar memory-based effect on denizens.