This build plays almost the same as Condition Specter with the exception of Well usage for Alacrity in combination with the trait Traversing Dusk. Due to how Consume Shadows and Enter Shadow Shroud scale with the high amount of Vitality present in this build, your heals and barriers will be stronger compared to Condition Specter. This is provided you can continuously generate shadow force by hitting your allies with your Wells.
Condition Alacrity Specter does its damage in two ways: weapon skills while not in Shadow Shroud and non-initiative spending skills while in Shadow Shroud.
While using your scepter/dagger weapon set, you will want to prioritize using Twilight Combo as your main source of damage. If you can’t cast it due to not having enough initiative, you can fill with your scepter Auto-attack chain and Siphon off-cooldown.