Shrouding Strike doesn't come in until level 3 of the destiny, yet we have one ability at level 1 that refers to Shadow Charges (Lance), and once you acquire Shrouding Strike, it doesn't actually do much of anything without purchasing other enhancements--you gain charges (though you can't see them listed anywhere as far as I can tell), but have no use for them.
Shrouding Strike itself needs something that works off of the charges. Have it add some damage to the attack you make, or add a debuff to those you mark, or...something. Maybe fold Executioner's Strike into Shrouding?
Right now, I'm using the Strike for the tiny bit of extra damage, but it's mostly so I have something else to do on my rogue, rather than for any effect its having.