Lethargy was a Thaumaturge action ability during the A Realm Reborn and Heavensward expansions. The ability was originally acquired at level 42 for Thaumaturges. It inflicted a single target with Slow and a 20% Heavy status effect for 12 seconds. Lethargy had an instant cast time and had a recast time of 30 seconds.
At the launch of the Stormblood expansion, Lethargy was removed from the Thaumaturge's arsenal. The ability was replaced with the Break role action.