I've never really had a problem.
I run an Assassin's Promise build with Dark Prison all the time, and typically only run out of energy if the enemy isn't dead by the time I use Impale.
My maximum attack-run is:
[skill]Assassin's Promise[/skill][skill]Dark Prison[/skill][skill]Dash[/skill][skill]Jagged Strike[/skill][skill]Wild Strike[/skill][skill]Death Blossom[/skill][skill]Impale[/skill] ....
... And that will use up my complete energy reserve, no more and no less, if I'm using Zealous Daggers.
Generally though I'll skip the shadow-step and dash for adjacent opponents, Dash alone for nearby opponents, and only Shadow Step at all for the first enemy coming into the battle.
If you're wondering why I'd Dash immediately after Dark Prison, it is generally because the speed difference often isn't quite enough to stop them being irritating without it (Wardens of the Trunk chasing perniciously after my team-mates). If they're not moving then I don't Dash, obviously.
For the record though... since Death's Charge isn't a hex, it cannot be used as a cover for Assassin's Promise. It might not last very long, but quite often I have been able to maintain the Promise only because DP was removed in its place.
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