Totally not how it works. Have you ever actually used it in PNP?
- Full round action. Not an attack, full round action ... stand still, do nothing, get hit. In DDO, this needs to correspond to a lengthy animation sequence, not simply a "swing".
- Target must be helpless. "real" stun, not the daze-stun some things generate or the silly paralyzing weapons that are *not* generating a helpless state. You know this, right?
- You automatically hit and it's automatically a critical. Target takes this damage. Note this is likely LESS DAMAGE than if you'd done a full round attack on it.
- As this is an auto-hit, it would (technically) disallow the use of attack-roll modifying stances in PNP (CE, PA, etc.)
- Target then makes a save with a DC based on the damage dealt; if it fails, it dies. Obviously the save would need to be scaled for DDO.