After all the nerfs to nightblade, hitting both Magblade and Stamblade, Nightblades in general need a buff. One of the simplest, but in my opinion fitting buff would be to take Reapers Mark of global cooldown, like they previously did with necro tethers.
The main reason no one slots Mark anymore (over ele drain on mag) is bc you can`t fit it in your burst combo. If you would set Mark of global cooldown you can very easily use it mid combo, for the sacrifice of one skillslot. That way stamblades can get breach back, which they lost on surprise attack and Magblades have an class alternative for Ele drain.