Garrote applies 3 stacks of Deathstalker's Mark to your target, unless Deathstalker's Mark is already active. You learn Mark for Death.
When you spend 5 or more combo points on attacks against a Marked target you consume an application of Deathstalker's Mark, dealing 54 Plague damage.
Mark for Death
Move your active Deathstalker's Mark to your target.