Shadow Legion[DDI] (Heroes of Shadow p75) creates a conjuration for each enemy in the area of effect, which each make an attack against the enemy it was created for. Great, that all makes sense.
However, the conjurations last until the end of the encounter. Do they continue to attack the creatures they were created next to? Do they make opportunity attacks? Can they chase their target across the map? Can they be attacked? What do they do when their target dies?
The power says the conjurations are the same size as their target creature, so I assume they occupy their space. (Then again, enemies take necrotic damage at the end of their turn for each conjuration adjacent to them or in their space...) However, since the power doesn't expressly state that they count as allies, I assume you can't use them for flanking, correct?