Some thoughts:
Using Veil to get into Res Orb range can be risky, take care selecting a Deep Strike point. If you deep strike within 6" of a unit and get bad scatter, you risk your Lord being destroyed or off the board where he does nothing. If the Lord teleports on his own, chances are he'll get shot at.
Don't put down the Staff so much, it's a decent weapon in the hands of a Lord designed to fight off light to MEQ infantry, effectively doubling the Lord's Attacks if within 6", against most troopers
I find the Destroyer Lord a good addition to a Wraith unit, if equipped with a Staff it can help pick off infantry and give the squad more attacks, as well as making it less fragile. If equipped with a Warscythe the unit is almost guarranteed a kill against most vehicles, due to the Wraith's Strength, the Scythe's powers and also the handy 'combat always against rear armour' rule. And since the Wraiths move fast, its less risky than Veil.